Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0e4b62a05361fd2…

MALICIOUS

PDF

80.2 KB Created: 2021-03-18 15:43:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: dbd40b09e3d42257f6e9d527acc91790 SHA-1: c7cc8df301060765c460d312c12b0eeb7070cf04 SHA-256: d0e4b62a05361fd2f13e232c444dd5f7d70e70a9d2095b6d66a8ea7c5656eda5
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains and potentially malicious content, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV also flagged this PDF as malicious, specifically as a phishing trojan. The embedded URLs and the heuristic firings suggest a phishing or malware distribution attempt, likely using the document as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/123?utm_term=divellec+guide+michelin PDF link annotation
    • http://ita-bio.fun/786699987380wp4n.pdfIn PDF document text
    • http://verifiedbadge-lnstagram.com/ecosmart_eco_27_electric_tankless_water_heater_manualb7rmu.pdfIn PDF document text
    • http://fastgetme.online/teaching_feeling_2._5_memories_guide0h9ys.pdfIn PDF document text
    • http://mexicotop.xyz/vizio_e470i-a0_backlight_repairxmhfj.pdfIn PDF document text
    • http://znohist.site/circassian_circle_sheet_musicuklfp.pdfIn PDF document text
    • http://radanews.site/712510120569eq35.pdfIn PDF document text
    • http://tikovg.xyz/fubonapurokex692ke.pdfIn PDF document text
    • http://potenciy.xyz/875283179547pw6x.pdfIn PDF document text
    • http://bosnoslovnoejelaniekupit.xyz/smart_voice_recorder_apk1r7ec.pdfIn PDF document text
    • http://psychologyrelax.xyz/can_you_still_buy_an_ipod_nanoef8eq.pdfIn PDF document text
    • http://datingdate.site/34170469910aelou.pdfIn PDF document text
    • http://damvglaz0.xyz/nurenixaziluw4aml.pdfIn PDF document text
    • 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://uploads.strikinglycdn.com/files/196e748a-1c26-46e6-a1e7-dfa2bf66f2be/john_deere_lawn_mower_for_sale_gumtree.pdfIn PDF document text
    • https://3bdad275-8828-414d-9063-9532e035d791.filesusr.com/ugd/c67d0c_421ce8ee6cda452684ab3abb07cd5662.pdf?index=trueIn PDF document text
    • https://e432c3f7-acc0-403b-bc7f-1b8c16782643.filesusr.com/ugd/6a4899_5d70e04e14284087bc7e09ca98826085.pdf?index=trueIn PDF document text
    • https://95043331-d9de-4498-ad98-35b8ac3ee23f.filesusr.com/ugd/5740b2_2e1999fc016442de818ee53767e6d282.pdf?index=trueIn PDF document text
    • https://76ed6b59-b034-43ac-b949-e1c08f76e3cb.filesusr.com/ugd/ee6100_ccc62b8f39e64c5aaf39e87c33e69884.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/251b9b47-44c8-4de3-b71b-cef76a9a0e3f/wujotanutilovetimevaten.pdfIn PDF document text
    • https://aed022ca-8a9d-452d-9022-56a74a585a14.filesusr.com/ugd/4d548e_8d92255946b946bbb4e62a76df046445.pdf?index=trueIn PDF document text
    • https://b73db3ac-2e3c-475a-83ab-7f4668f00a8f.filesusr.com/ugd/80e8fa_1b9e76d6e5e945dfae0913d4222e78e8.pdf?index=trueIn PDF document text
    • https://aefbb2f1-1cfc-4a48-aab2-d72547d84173.filesusr.com/ugd/2f3ac6_973dc8ccbc6045608b374c31d5d84258.pdf?index=trueIn PDF document text
    • https://327bbe42-9aa5-4ca0-80e5-6c9857058a26.filesusr.com/ugd/2b870b_65c49062f94147f5b68a1562219458b6.pdf?index=trueIn PDF document text
    • https://f78a7b13-e75c-4ddc-9f3c-03cd83736f6c.filesusr.com/ugd/90c53f_67bbf14e541d484ab15f1f5afef09493.pdf?index=trueIn 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_off0000edca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCA 4620 bytes
SHA-256: 925564c24f2394749e65eda32d920da086dab2103d8f626439522d75dd71accb
font_01_sfnt_off0000fd5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5B 12756 bytes
SHA-256: c3c5d74ad1de174f5383bfda632d018965801627ac95da9da7c7e0cfc6023437
font_02_sfnt_off00012548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12548 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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