Malicious PDF — malware analysis report

Static analysis result for SHA-256 5091cbe79a98995e…

MALICIOUS

PDF

87.3 KB Created: 2021-03-31 17:45:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: f02e12a3ecbd4573e4e811df83099c0e SHA-1: 0f946ae04e9a94eb34c401f1316bf776b42204be SHA-256: 5091cbe79a98995e8581987deb5078447fdb03ff08979d1512c27a056c3a7281
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier, indicating it is likely a phishing or SEO spam document. It contains a large number of external links, many pointing to disposable hosting services, suggesting an attempt to manipulate search engine rankings or redirect users to malicious sites. No scripts were extracted, but the presence of numerous external links is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://fokemale.ru/123?utm_term=3ds+max+logo+animation+templates PDF link annotation
    • https://cdn.sqhk.co/bajipugotox/tzhdOji/betakemotitamowos.pdfIn PDF document text
    • https://cdn.sqhk.co/nisugavu/jaJzgib/61502014848.pdfIn PDF document text
    • https://cdn.sqhk.co/zujumatatub/ghjaEmi/wolo_dixie_horn_sound.pdfIn PDF document text
    • https://cdn.sqhk.co/moxibusas/ibggjcc/pelagedapunudiropofirezu.pdfIn PDF document text
    • https://cdn.sqhk.co/pinuwinepasu/exghLjj/load_key_authorized_keys_invalid_format.pdfIn PDF document text
    • https://zazafiwizodizi.weebly.com/uploads/1/3/4/0/134041258/paxovulalaseto_xazebidigoxaw.pdfIn PDF document text
    • https://cdn.sqhk.co/nomelafu/jiKWAig/5027966654.pdfIn PDF document text
    • https://sizuwebon.weebly.com/uploads/1/3/0/8/130814729/214ca76b4903.pdfIn PDF document text
    • http://bestsaleshopin.xyz/liquidos_y_electrolitos_en_cirugiarc58g.pdfIn PDF document text
    • https://tesujirigagorin.weebly.com/uploads/1/3/4/8/134869290/wixapusitevu-lukukig-bevuzari-zexuvitosef.pdfIn PDF document text
    • http://xxlmature.site/luvufupimixamevxpdm.pdfIn PDF document text
    • http://esagafow.fun/how_to_look_up_old_sat_scores_onlinedo47y.pdfIn PDF document text
    • https://cdn.sqhk.co/muxaferamet/gdsSSii/zazekate.pdfIn PDF document text
    • https://cdn.sqhk.co/jogepirar/bHUhiJv/pupanujefaj.pdfIn PDF document text
    • http://ing-cliente.com/levofelizajidbdsg.pdfIn PDF document text
    • https://cdn.sqhk.co/zivuputid/EShfGhj/pijolunapamavafiritemaz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d15a98ad-5a23-4920-b479-8fa1b89efca1/ridgid_orbital_sander_troubleshooting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af3e14a6-9aa5-4e48-9a09-c5c0cb52349f/fisher_price_snugabunny_swing_motor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28874629-3319-43d1-a175-d43d315dc200/72830320485.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf7a57e6-439c-4a5e-a24f-9f065d1ae9b6/66820248965.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86fa3f0f-b5f9-413f-9fcc-503f28b22aee/23316842980.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78734f55-429e-4d8a-a8e8-e44cc4b70096/83368397409.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000118b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B0 5320 bytes
SHA-256: bcdc63704fbf48c50ebb3cf2744c558de1d46063044f127508085e0f89208b38
font_01_sfnt_off00012aba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ABA 10892 bytes
SHA-256: e5aa1b6cf5a37f60c05593ca38f12bc5f7f2fccbeaa176c2c1d1c716a93336c8