Malicious PDF — malware analysis report

Static analysis result for SHA-256 3321cc51c29bd068…

MALICIOUS

PDF

99.8 KB Created: 2021-03-15 04:25:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: cf2ea0101b70e7c0ce2b019038047d53 SHA-1: 51278e863882e044a15bd3cc01080190f0ae8de3 SHA-256: 3321cc51c29bd068f7ebc0cbd3f3c16a2ff4981f1a303c135830c5e9c20a6002
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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/wix?keyword=ad%2526d+2e+castle+guide PDF link annotation
    • https://cdn.sqhk.co/dufimogemeka/xaifmgd/bubble_shooter_legend_mod_apk_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/keropolor/dm1jihi/zozowukosopagamubiw.pdfIn PDF document text
    • http://mediaverifiedbadge.com/ge_profile_microwave_service_manual88gus.pdfIn PDF document text
    • https://cdn.sqhk.co/xijogedobu/hjZmabH/spin_warriors_istanbul_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/nupepewomaxu/edgjAkU/dragon_clash_pocket_battle_apk.pdfIn PDF document text
    • http://tryadasert.online/fowemuwajemumanefvyaeq.pdfIn PDF document text
    • http://new-leggins.site/ap_biology_biochemistry_practice_testypr8z.pdfIn PDF document text
    • https://cdn.sqhk.co/xarozowuzosa/dkiitje/delavi.pdfIn PDF document text
    • https://cdn.sqhk.co/nuxasedazu/W2ggijI/fulalidobasedazulelusab.pdfIn PDF document text
    • http://cetop.xyz/89199556954s0q1a.pdfIn PDF document text
    • https://cdn.sqhk.co/sipupubu/b65jghc/95202615810.pdfIn PDF document text
    • http://quinzsy-studio.design/10969713908mlhil.pdfIn PDF document text
    • http://jsexj.fun/xeminw73n2.pdfIn PDF document text
    • http://masterpowerpoint.com/31895751705mopn9.pdfIn PDF document text
    • https://cdn.sqhk.co/vakenuda/Lhijh2j/hashtags_best_tags_for_likes_followers_on_instagram.pdfIn PDF document text
    • http://agentsecure.space/chokher_bali_book_in_bengalitashj.pdfIn PDF document text
    • https://cdn.sqhk.co/nejisakatok/c5hbLge/my_t_mobile_login_problems.pdfIn PDF document text
    • http://ozalupa.space/hungry_shark_hile_indir_androidxwlt3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://20996a60-9695-4f45-8fdb-44bdc783da55.filesusr.com/ugd/c57cae_170d203b6be8443f92d1fa47a53b16b4.pdf?index=trueIn PDF document text
    • https://77abcf6a-1f47-4233-a5f7-28832101be0a.filesusr.com/ugd/e29e5c_ee4003e405114bd18e8de3a476ac8abb.pdf?index=trueIn PDF document text
    • https://19527f6f-7821-4b33-8e58-d909ab9a203f.filesusr.com/ugd/b18fc6_67723323580340c483f545d2c0b0237f.pdf?index=trueIn PDF document text
    • https://855e1e5b-0daf-4dce-aa73-dfad2bfec5df.filesusr.com/ugd/ced2dc_18dd8dd878ac42a7964c119990e8970c.pdf?index=trueIn PDF document text
    • https://6cbe2f5c-748b-4bc6-b691-25a968a47885.filesusr.com/ugd/d6b5da_6bf4eb1b83c34486bef3fc0e92cd2e5a.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_off0001320d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1320D 3456 bytes
SHA-256: 9031f9da0f17eceefd7acd9d95065c54c99f454a7a3db74866dcb363253c625f
font_01_sfnt_off00013e64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E64 4288 bytes
SHA-256: 888abd2aedfa77d3f1bd84f045dbb22eead52b4c9aafd5b6d6986541f3e834a3
font_02_sfnt_off00014cfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CFD 16328 bytes
SHA-256: fddc3db0e6de82b1f6f60ac906d6c4a10cdd3c4d67c85de1605b892bbaa4b164