Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5717df921afc4eb…

MALICIOUS

PDF

67.6 KB Created: 2021-04-06 01:47:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 91bf15b34e11ced2e016d8eb24b52461 SHA-1: 47fc19305cdca956d8ee1a2e4f310a99bbbf1dd6 SHA-256: b5717df921afc4ebdf32a0c63ebad3be698bd9c990e465bceffe73744cacfc31
184 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm. The primary URL, https://crophysi.ru/aws?utm_term=what+to+make+for+dinner+tonight+veggie, suggests a potential lure or SEO manipulation tactic. While no scripts were explicitly extracted, the heuristic firings indicate the PDF's structure is designed to host numerous links, potentially leading to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7003

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
  • 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
  • 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://crophysi.ru/aws?utm_term=what+to+make+for+dinner+tonight+veggie
    • https://xilamebi.weebly.com/uploads/1/3/4/5/134598653/2835e723a.pdf
    • https://furiraduwonejos.weebly.com/uploads/1/3/4/8/134870793/9d9027390e2.pdf
    • https://nobakunifiximup.weebly.com/uploads/1/3/5/3/135310199/6440505.pdf
    • https://viwoxinuzozaxa.weebly.com/uploads/1/3/1/6/131636825/zelimovinisegol.pdf
    • https://saranadizalexe.weebly.com/uploads/1/3/0/9/130969301/naroguvovipul.pdf
    • https://monubigikupo.weebly.com/uploads/1/3/4/4/134493781/f139f294.pdf
    • https://rurusoweloxefug.weebly.com/uploads/1/3/3/9/133989150/dcef97920.pdf
    • https://tavurusifuta.weebly.com/uploads/1/3/0/7/130740255/gadikunom.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dudigonifu/dezodaruger.pdf
    • https://s3.amazonaws.com/pigolo/giving_opinions_worksheet.pdf
    • https://cc0b58a5-7bf4-4b41-9cd7-d9bc0cd2cc6f.filesusr.com/ugd/6dc98b_1da8f4b69cd04ff7a115aaa24c03fdf0.pdf?index=true
    • https://s3.amazonaws.com/julaxel/merarodepunenarepes.pdf
    • https://ce2645ba-e89a-43d5-afff-5c0150757291.filesusr.com/ugd/c63dba_967ff213a6bc4fbfaac79909693192ff.pdf?index=true
    • https://8316a071-1c81-4729-bbc9-bb84f51c1359.filesusr.com/ugd/b2ba6b_7a4bb79d88774ad496ae65d7dcd36db2.pdf?index=true
    • https://s3.amazonaws.com/xedewofuretujo/77467692958.pdf
    • https://77047a80-9f17-4504-a563-a097c25ca12e.filesusr.com/ugd/5c8b2f_d6487d9adfac4b5d96e66a145cc4f210.pdf?index=true
    • https://51956041-da35-40aa-96c1-085c1f47c80d.filesusr.com/ugd/e6e573_cc199b9eaaf14d498d98224dc98bd0ae.pdf?index=true
    • https://42190e62-4dca-482d-a077-ae7b222d7779.filesusr.com/ugd/b91392_bd0d0cce70bc43b3ae4fc7cdeef83e88.pdf?index=true
    • https://s3.amazonaws.com/jitimesolagun/patazomojojafesorufisaj.pdf
    • https://786c536d-253b-4a15-94df-129c4693a223.filesusr.com/ugd/1fc311_58e6b5fbb0164f538f8fd6e2883db56d.pdf?index=true
    • https://6a24fdd2-d4a5-4c4b-882b-0f3115751bcf.filesusr.com/ugd/04e6f9_c57f0089e5eb4af5a1be05d27f399876.pdf?index=true
    • https://6843e3eb-5573-46e1-90a0-370cfc2b4a0d.filesusr.com/ugd/89b1bc_0e786a2b518f48d985082ec4299f3f57.pdf?index=true
    • https://e1eccfe9-8888-4f52-a155-e9c8e84e0752.filesusr.com/ugd/4fb05f_5487716fdeb64a1abc9184820d691d3b.pdf?index=true
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2f1.bin
4568422bb350f437039654749c68c75cdfdd0a558511b83f217e439b63d4ba45		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F1 5248 bytes

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