Malicious PDF — malware analysis report

Static analysis result for SHA-256 71f9e4a639b596d2…

MALICIOUS

PDF

83.2 KB Created: 2021-04-20 12:43:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 94173524d74b6ded84addbe311e93eaa SHA-1: 226751378ec816a154b78d11816a8e05e08a52ad SHA-256: 71f9e4a639b596d2a74f72d4346ed601eb38fe59440d5870f120056261580b86
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://jottigo.ru/strik?utm_term=catia+v5+training+videos+download PDF link annotation
    • https://cdn.sqhk.co/pafevola/lNJNiaT/29944131866.pdfIn PDF document text
    • https://cdn.sqhk.co/wujamufaw/gfhbAhi/joxinupesuxajezivu.pdfIn PDF document text
    • https://cdn.sqhk.co/duvapegoleva/OeUuvic/sustainable_tourism_business_degree.pdfIn PDF document text
    • https://cdn.sqhk.co/kevekelobivo/ifYb4je/cat_fishing_rods_for_sale_in_manchester.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://1b6fe947-be7e-4494-9a94-f566f178d3d1.filesusr.com/ugd/89064d_e134d59db23147e4a12eb97bd4f8a016.pdf?index=trueIn PDF document text
    • https://1b6fe947-be7e-4494-9a94-f566f178d3d1.filesusr.com/ugd/89064d_459d0905b7b04b61a10485af38f26400.pdf?index=trueIn PDF document text
    • https://492f55f4-3442-4b37-b17e-39d9f2f0ae8a.filesusr.com/ugd/7dfe85_e6a7865740b6466c9802609e52d99f59.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/88edfdf6-e6da-4787-a56d-552752d2dd20/one_year_bible_online.pdfIn PDF document text
    • http://zadosuwiwebuw.epizy.com/spring_boot_security_documentation.pdfIn PDF document text
    • http://xonisuxumezitez.epizy.com/93441577397.pdfIn PDF document text
    • http://putojoner.rf.gd/sibul.pdfIn PDF document text
    • https://44eeb0f0-4dc9-4d8b-b3fd-cc7ace98e90e.filesusr.com/ugd/a083a1_cb03cacb132b459885702cbbb0bd6daa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c331bd02-5626-494e-8ead-efd3690d7958/how_to_remove_anode_rod_from_rv_water_heater.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e64305c7-e8b9-4459-bf1c-f0aa8989533f/sabajutedafo.pdfIn PDF document text
    • http://dosekidonara.epizy.com/vosofokogomukilolalu.pdfIn PDF document text
    • https://ca3ec1ac-6ff7-4c8f-ae0f-86a30d86e335.filesusr.com/ugd/3615fb_273d4fcdbb6440a180379ebef22448ad.pdf?index=trueIn PDF document text
    • https://bf68d742-fb98-404a-ab47-1dcf24f7df52.filesusr.com/ugd/83e7fd_9340f1aaf88f454ba1f4a27f3d9f6adb.pdf?index=trueIn PDF document text
    • https://313cea95-bd78-4864-9d9d-3b26c3bbe0bd.filesusr.com/ugd/2142af_f1e1b0decc7b4e2d9526f03fd097b75e.pdf?index=trueIn PDF document text
    • https://01d7ec8a-e38e-4e33-8c76-1be31754498b.filesusr.com/ugd/24d943_46466e848eb54a2a93743c0dbbbf0a4e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8319eff9-3538-4991-8d42-ea41d7804a11/summary_of_by_the_shores_of_silver_lake.pdfIn PDF document text
    • https://ac09d6fb-20d1-47e2-97cb-2568fc137cdf.filesusr.com/ugd/03dcd4_e5589acfd3484542921e9f327afd54f3.pdf?index=trueIn PDF document text
    • https://161abad2-7de2-49bb-9904-d6e2a620a662.filesusr.com/ugd/2eec94_7f14c53371ef4e72af196836889d4bed.pdf?index=trueIn PDF document text
    • https://d25e5d79-f3dc-43ab-8538-58f2f4730235.filesusr.com/ugd/898300_6c47c524d9d74e1ab2b130143306d37c.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_off0000f7f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F4 5080 bytes
SHA-256: e2838cd572216c2ff20bcc55605e0b20e7877b8e06abd53a5e299d5dfe69cf17
font_01_sfnt_off0001095f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095F 11740 bytes
SHA-256: f941b895bf185a51e93aad51ca87ab9906bc7eee086246af505c33ba58803c03
font_02_sfnt_off000130ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130EA 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e