Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f8c8811d9ff0db0…

MALICIOUS

PDF

79.4 KB Created: 2021-04-04 12:10:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: c5ccbdfaee0edf2e6d41f457347312c3 SHA-1: 7af218e04834ee0b16ba9b6c701817a6cfeefbe2 SHA-256: 1f8c8811d9ff0db0dd669b2868c128690b910b5e40558a806b8a6f7822d5ff7b
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a significant number of external links, many pointing to disposable hosting, indicating a link farm designed to direct users to potentially malicious sites. The presence of the URL 'https://soxebez.ru/strik?utm_term=why+won%2527t+my+dishwasher+wash' and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggest a phishing or malware distribution attempt. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://soxebez.ru/strik?utm_term=why+won%2527t+my+dishwasher+wash PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://3465328d-eb21-4af5-a94e-b8fdacefaafa.filesusr.com/ugd/c63bf9_d42e096eba0a47f381cf232648e1aed4.pdf?index=trueIn PDF document text
    • https://dbba0f06-1911-40f0-8c80-a2638c7f81cc.filesusr.com/ugd/b13fd1_adc0fd4a059147b1881a694e8f693017.pdf?index=trueIn PDF document text
    • https://828c6a01-da61-4814-986a-f72e64f4f334.filesusr.com/ugd/cdfdba_e560d432cd574919b4d5d09a7fdf2f3f.pdf?index=trueIn PDF document text
    • https://348ddb29-83e1-4812-94a1-743b72ef9b42.filesusr.com/ugd/23b571_bf4ae5793e5d4733bc2b5046d3f2f6c8.pdf?index=trueIn PDF document text
    • https://2ac8321c-28d8-41c8-ac7a-99137a6fe030.filesusr.com/ugd/157ee0_64620441ab05412fbc3a3ae2f9a2c7c3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9b28d21-e99c-4cbf-886e-fb1f7f1e2b1a/87659558638.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d288c1f-25ee-45b7-9f11-b109499d2ef4/2020_ford_mustang_gt_convertible_price_in_india.pdfIn PDF document text
    • https://8eeb1f0a-0cdd-4c66-98a4-83777b49fb54.filesusr.com/ugd/64f9d2_2db37ac28bd84da9a620f7f8853ad904.pdf?index=trueIn PDF document text
    • https://2571d5ef-7130-409a-b87d-c3fd18a83f30.filesusr.com/ugd/71fc55_f477a3d8e45445708806893ea84e57a1.pdf?index=trueIn PDF document text
    • https://d4078116-a2d5-466f-97e6-20d899f6ca30.filesusr.com/ugd/576447_57ddc55fd3284a87a9aafb4be5156b81.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c515bec-5b2d-4a42-acb9-092a7a5120fb/2005_cadillac_cts_ls_swap.pdfIn PDF document text
    • https://1fa67a36-2e8b-44cc-a955-751d80433762.filesusr.com/ugd/d85e51_b073255475e54c59a5da8c7dc918e5ed.pdf?index=trueIn PDF document text
    • https://091a8774-b5bd-4fb7-8799-8d1ca0ca44ad.filesusr.com/ugd/8716ab_4dcf32e51c674e29bf2969e26404bdc0.pdf?index=trueIn PDF document text
    • https://2a4065d7-883d-43e8-a524-7ce9aa4b4e88.filesusr.com/ugd/ccb1c6_103b145d979c42b6810dbb50b9636530.pdf?index=trueIn PDF document text
    • https://d0bf7e8b-5449-41c0-93e9-161603c0719f.filesusr.com/ugd/197ed4_04e7b5994afb4f998f1b2a25fe845de2.pdf?index=trueIn PDF document text
    • https://d80868e2-5d34-4dda-9345-0396294a35aa.filesusr.com/ugd/f9fac6_797618370c4a48e9aeecff57f3fba42e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0b87398-ad4a-4626-80f2-91eceb7492ed/quiz_logo_game_answers_level_20.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/220eb6e1-ea27-4c0c-8653-0ea7c88747ef/fetesexifejivekaketukabe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97b598df-9c00-4d40-a70b-2e7155666983/bujanowipix.pdfIn PDF document text
    • https://cc46d2ba-e7cf-42f8-aa62-b015a0c17ef0.filesusr.com/ugd/d180c3_9ba5e54b937445fab4633453be0d880c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/aeed6623-7fde-4b68-bfa8-8950fb88c1cd/gebikebonesitiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/288e29aa-a65e-4d7d-85c2-cc1cc216ea1a/marlin_model_60_.22_reviews.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAC 5060 bytes
SHA-256: 29d2ed3520b7ee021fb52df0f22c3181b13d8596990a6159bda1a2a2940bf772
font_01_sfnt_off0000fcc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC4 11240 bytes
SHA-256: 1ff6f6da748a9515e5581685ba4fe99e7b3ad4161b4aaa2de8a71e3495b7a830
font_02_sfnt_off0001223e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1223E 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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