Malicious PDF — malware analysis report

Static analysis result for SHA-256 9467fb48b22d68cd…

MALICIOUS

PDF

78.2 KB Created: 2021-02-18 16:41:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 3a72ec5e83b7dfc06e34a567a38519e8 SHA-1: 9e6a5ad184202aea57bae32bc7079e5400dc07ed SHA-256: 9467fb48b22d68cde1297365e5ba07151240d6fa9304778eb9e2087624243274
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs pointing to other PDF files hosted on disposable domains. The heuristic 'PDF_SEO_LINK_FARM' strongly suggests this is a tactic to distribute malicious content or phish users. The presence of external URIs and the link farm structure are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://baarspo.ru/strik?utm_term=what+is+esperanza+rising+about PDF link annotation
    • https://regenapewafixun.weebly.com/uploads/1/3/4/3/134364718/bcda9b3dd3.pdfIn PDF document text
    • https://cdn.sqhk.co/povuguzuloga/Oanhaia/the_penguin_runner_world.pdfIn PDF document text
    • https://cdn.sqhk.co/kajipazuto/B653hfK/gojatawoxapokuzo.pdfIn PDF document text
    • http://topcreditmonitoring.info/pojozowisac9a1u.pdfIn PDF document text
    • http://tapabafana.22web.org/pusog.pdfIn PDF document text
    • https://cdn.sqhk.co/giravopakiw/j3ggMsB/the_dark_pursuer_gameplay.pdfIn PDF document text
    • https://viwosexoteb.weebly.com/uploads/1/3/4/6/134631328/2052114.pdfIn PDF document text
    • http://cardioactiveuficiale.site/nimilekipelenetatawyou5.pdfIn PDF document text
    • https://cdn.sqhk.co/gagowuname/Xzc6gjb/assistant_manager_resume_retail.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417314/normal_60023dd845b3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409396/normal_60148c9026e32.pdfIn PDF document text
    • http://vofovadero.22web.org/25979806733.pdfIn PDF document text
    • http://rollernefrit.xyz/best_alaska_cruise_deals_20218aaa3.pdfIn PDF document text
    • https://sadijamozu.weebly.com/uploads/1/3/0/8/130814559/xokokoguxufobibafox.pdfIn PDF document text
    • http://ig-mediateam.net/xupixuruwabuahdv.pdfIn PDF document text
    • https://dobopekajami.weebly.com/uploads/1/3/4/3/134314215/wipiposisuz.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://s3.amazonaws.com/kakekojezutok/74909715450.pdfIn PDF document text
    • http://wasamatebupo.rf.gd/digijoz.pdfIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/mlb_postseason_format_2018.pdfIn PDF document text
    • http://favirivesez.epizy.com/simewofug.pdfIn PDF document text
    • http://masuravapenu.rf.gd/95855038914.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_off0000e33b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33B 5132 bytes
SHA-256: 5b9a4fcfcef815af41b8d266575ce97160d1048ac5e23c96a92e86c468c34d3d
font_01_sfnt_off0000f4b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B8 11492 bytes
SHA-256: fbb7cbfe23fa7c45356680631a7b6c398b31833ced0f3ff980e698867a68f875
font_02_sfnt_off00011b90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B90 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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