Malicious PDF — malware analysis report

Static analysis result for SHA-256 a70733ca3b2a5b80…

MALICIOUS

PDF

76.2 KB Created: 2021-03-14 14:27:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8139a6907b49857874edbda74a276a69 SHA-1: 27094921a337e3dac023e8519d1278c669702d49 SHA-256: a70733ca3b2a5b80fa6fe827d0226ef6fb973b5531f171d95c549d5b58774299
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for link farms and phishing sites. The heuristic PDF_SEO_LINK_FARM indicates a large number of generated links, suggesting an attempt to manipulate search results or direct users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gimoguvi.ru/wix?keyword=apk+mirror+amazon
    • https://cdn.sqhk.co/bugolajoxodu/hija1bx/samsung_email_app_not_working.pdf
    • https://static.s123-cdn-static.com/uploads/4461250/normal_5ff70e6c3b363.pdf
    • https://cdn.sqhk.co/nakotuba/e3gdTsf/feudal_japanese_samurai.pdf
    • https://cdn.sqhk.co/naxupowu/gch1wgh/dagegexomipaba.pdf
    • https://cdn-cms.f-static.net/uploads/4484994/normal_5fd6363415a44.pdf
    • https://cdn.sqhk.co/vijasezadida/Xid3aYB/85694582920.pdf
    • https://cdn.sqhk.co/fotenulutis/fjigJhj/nenoneludugumupufuw.pdf
    • https://cdn.sqhk.co/xasomegupur/hdVPx1E/dead_alone_wallpaper.pdf
    • https://cdn.sqhk.co/duxadikoti/ggcjgjj/japanese_translator_jobs_salary_uk.pdf
    • https://cdn-cms.f-static.net/uploads/4365549/normal_6032e8aecae07.pdf
    • https://cdn.sqhk.co/bidubuwawi/lbhhhcC/nijozijawosififomaniji.pdf
    • https://static.s123-cdn-static.com/uploads/4368991/normal_5fca21b713c82.pdf
    • https://static.s123-cdn-static.com/uploads/4417140/normal_5fc73ba769e1e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://aca292c6-a3ee-4c96-b4c9-db15c8eca1b9.filesusr.com/ugd/cd1d52_b62dc09295534e6987862b2e38577276.pdf?index=true
    • https://76bf09fe-c378-4d6f-baa9-beaf48595a8b.filesusr.com/ugd/61567a_9efcd9a967244efba4443189586863ad.pdf?index=true
    • https://ef9935f7-a918-44a1-999f-f1d50a45e4a7.filesusr.com/ugd/b463f2_b1bfec3b07b3427aad61abe228c816e1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3edc6bed-94f5-440d-9763-12e0cd59d95b/antiderivative_of_csc_x_cot_x.pdf
    • https://2703069b-a6ff-4ff9-983c-db139a8d76ba.filesusr.com/ugd/8b61cf_e4ecc345049f439f8684fa4f13a37570.pdf?index=true
    • https://4f0754e2-f0c4-47db-826b-83042027646c.filesusr.com/ugd/7a11b0_c17ed55d406643afbaccabb5c88ece21.pdf?index=true
    • https://30c0d994-bee2-4d79-bc91-d4aaa7251653.filesusr.com/ugd/0962d9_fb542fc73e79494299f4697a2b176b48.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8e713521-fa99-4995-93ad-e4f8073d4dbf/76734543395.pdf
    • https://uploads.strikinglycdn.com/files/12b67bcb-c99a-4da5-b545-82e77ce4a6f9/quotes_from_red_queen_with_page_numbers.pdf
    • https://uploads.strikinglycdn.com/files/f92fe7a5-2054-4fae-852e-358db193cb98/xesos.pdf
    • https://1a6defe7-92a0-4357-8a70-d3bce85d30c9.filesusr.com/ugd/385065_a82987dd670e4c04a9aa4ca5892160a6.pdf?index=true
    • https://eeff404e-5492-4914-a1d7-e39d1f35e6b2.filesusr.com/ugd/e58d70_7a2e9353b3ec49bbb7f760df1014069c.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea8b.bin
ec5b68943c0182ff87f7cfb9f4903b7fdb697addc210018640c66a5e66b44ce1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8B 4860 bytes
font_01_sfnt_off0000fb06.bin
b6c06b5995cbc64ed4bd8a552bc881a9eb4c98bf1f0cbf917d15f2bc414b5cef		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB06 12340 bytes

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