Malicious PDF — malware analysis report

Static analysis result for SHA-256 90f5efba167ac030…

MALICIOUS

PDF

75.4 KB Created: 2021-06-05 12:23:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 34656436b8742906f5e434b0fa3123c9 SHA-1: a891834c1ef18a01a6993bed6177b1fae2bfcf8b SHA-256: 90f5efba167ac0300e868a1e5ef956e29e01fe5f22172cb7c3106eeb2b8b217f
194 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The presence of 'utm_term' in one of the URLs suggests an attempt to track user clicks. While no scripts were explicitly extracted, the ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://queure.ru/pbw?utm_term=escort+xr3i+wheels PDF link annotation
    • https://dasibovuripuxub.weebly.com/uploads/1/3/4/8/134860981/0386a0a5.pdfIn PDF document text
    • https://patelevikukel.weebly.com/uploads/1/3/4/6/134665122/2672628.pdfIn PDF document text
    • https://zetolame.weebly.com/uploads/1/3/0/7/130775520/2f6c04.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4388405/normal_60b66ea654e3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476281/normal_600dbf8921717.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494139/normal_6015af8aa3010.pdfIn PDF document text
    • https://xorizelipuv.weebly.com/uploads/1/3/1/6/131637744/2746918.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426699/normal_6047f3f4b94b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383573/normal_6069190430829.pdfIn PDF document text
    • https://xexiroxenokela.weebly.com/uploads/1/3/4/6/134613030/migakasan.pdfIn PDF document text
    • https://lepoboniw.weebly.com/uploads/1/3/0/9/130969744/jozotovaleva-fuxitolo-kidisegijasuno-selidid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485693/normal_5fd78f9e4d388.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481055/normal_6061ae9b31778.pdfIn PDF document text
    • https://widowajezow.weebly.com/uploads/1/3/4/5/134584852/saruxunosol-xirumedonakukut-letujapedomeb-pugin.pdfIn PDF document text
    • https://nagejezesalu.weebly.com/uploads/1/3/0/8/130874580/40534894f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407327/normal_606e7d0a40bf4.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/e8fc7659-3fca-4819-88aa-fb3a8a0ed92f/taotao_atv_troubleshooting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f54d189b-26f4-4bac-9d29-7836c6bac273/31103787488.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4172c675-d6e3-4747-bd83-8cb8fe360a27/carpentry_basics_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89ea5a66-666c-4af5-af45-2b32f247a8e6/22647804160.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d77f6ce3-c20c-473b-b310-2ec647e2cc3a/80678507570.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19eccc86-59c8-47fd-8301-86ec5fd9312a/the_stolen_party_commonlit_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a13a2e27-e7bf-4a0a-a6e2-ce65c334a471/opening_to_the_neverending_story_3_vhs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbbf0961-9c1a-406a-98ba-7a3c76d05186/binotugizem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/232d6fff-82b3-40b3-9356-3bb2fea2d36b/historia_de_estados_unidos_resumen_corto_para_nios.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_off0000e9af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AF 4960 bytes
SHA-256: 33f8a1f65aeff3daa57df1106653b72180143d9bdc756bf88060981d4f97ed12
font_01_sfnt_off0000faa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA7 10984 bytes
SHA-256: 1fc7e4b989baeb9452aad26f5b8cf95bd62afab96935e5096881675516a54898