Malicious PDF — malware analysis report

Static analysis result for SHA-256 59bdbb0a0f651f46…

MALICIOUS

PDF

91.9 KB Created: 2021-03-30 19:46:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb9d869d68b3ff38b5e039ded770284d SHA-1: d0bf6c1376577db328eeaff7ce1d761bd86089c3 SHA-256: 59bdbb0a0f651f4646753e6ad8906e056ebb99f6187e031bbdee52bf9e8051fe
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are part of a link farm designed to improve search engine rankings. The document's content, though heavily obfuscated, appears to be a lure related to 'Ielts answer sheet pdf writing task 2'. The presence of external links and the link farm heuristic strongly suggest a phishing or SEO spam campaign. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dafemum.ru/award?keyword=ielts+answer+sheet+pdf+writing+task+2
    • https://gapuropiti.weebly.com/uploads/1/3/2/7/132740804/8264019.pdf
    • https://cdn-cms.f-static.net/uploads/4393908/normal_600bbaf210aa6.pdf
    • https://zusonugen.weebly.com/uploads/1/3/5/3/135305237/b8d4bb8605363c.pdf
    • https://bizonununifewe.weebly.com/uploads/1/3/4/7/134773553/ditewimutisirazidate.pdf
    • https://jawavovamote.weebly.com/uploads/1/3/4/7/134748122/luzuvebozixuvepovemo.pdf
    • http://matizaw.mywebcommunity.org/83945790664.pdf
    • https://static.s123-cdn-static.com/uploads/4365628/normal_5ffb0ff28a2d0.pdf
    • http://finonit.mypressonline.com/why_is_my_router_not_receiving_internet.pdf
    • http://mamubisuk.mypressonline.com/session_horns_pro_vs_session_horns.pdf
    • http://kafofal.mygamesonline.org/44356781394.pdf
    • http://vomamafawib.scienceontheweb.net/ford_3000_tractor_weight.pdf
    • https://static.s123-cdn-static.com/uploads/4473062/normal_5fff753e96bef.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gegetebipa.atwebpages.com/42629209046.pdf
    • https://7ae774ad-b64d-4473-a0b1-aa0db1e39e83.filesusr.com/ugd/3e7897_9b5dffb139ea4732bf4a0c623871cb9e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4fc6925f-a7ac-43e5-84d5-03935f4b3e2b/91504636008.pdf
    • https://uploads.strikinglycdn.com/files/7d0aa393-7595-42f5-b306-6f8a9a4b904e/breville_compact_smart_oven_parts.pdf
    • https://uploads.strikinglycdn.com/files/e9e1d7dd-2076-4807-b085-9f42a5271f78/24207555086.pdf
    • https://4ac36a2f-1533-488b-b282-cf34cdace458.filesusr.com/ugd/bcfc12_3f9076ffc4da4ed483ebacf94135c30a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3390ad34-f17a-4965-9664-cb5627761754/u_verse_tv_remote_setup.pdf
    • https://uploads.strikinglycdn.com/files/957120ad-d327-4467-97d8-1dbedc44043a/55073507359.pdf
    • https://945c5b1a-9feb-4a08-b72d-c905ca1b1520.filesusr.com/ugd/27135d_8540f240799442b190dd35c6d985c5f8.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_off00012906.bin
ebe3349b1464231f0e954fe80ff9590b5659dc951166e80629e09341af212447		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12906 5528 bytes
font_01_sfnt_off00013be5.bin
06b3c0e0c990ca17a64ef01526b1c7f30832765e7fbca0acaa02d9bb3222e11a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13BE5 11172 bytes

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