Malicious PDF — malware analysis report

Static analysis result for SHA-256 790816f2cae336bb…

MALICIOUS

PDF

92.0 KB Created: 2021-05-11 00:10:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 0cf0cc7b003cc3faaf1aed3ba69400ba SHA-1: 41bfd8707e04ce35992857cbf5924a6d9bc4b4ce SHA-256: 790816f2cae336bb339724134290c2de070d3b3dcc193c38b19c3177eaaf7433
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/strik?utm_term=the+vampire+diaries+season+8+cast+georgie PDF link annotation
    • https://cdn.sqhk.co/berazanoga/heYoTgj/dish_anywhere_not_working.pdfIn PDF document text
    • https://xoburevedevubuv.weebly.com/uploads/1/3/1/3/131380480/ninuwujumoku.pdfIn PDF document text
    • https://lufeziwupidel.weebly.com/uploads/1/3/5/3/135345985/268892eaa9.pdfIn PDF document text
    • https://cdn.sqhk.co/nisugavu/Vihycmu/you_are_god_alone_william_mcdowell_bpm.pdfIn PDF document text
    • https://cdn.sqhk.co/xosuridasago/iiaHXCu/hey_clay_dinos_stegosaurus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b1e6e3cd-24a2-426a-8b7d-e8f4bd81915b.filesusr.com/ugd/83e584_647218ff1375416e8408d6e4dddcb20b.pdf?index=trueIn PDF document text
    • https://75e6061f-eb7a-4ce8-b546-077bf96366c3.filesusr.com/ugd/2dfd19_798296dad564435d82525c36474c6b88.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e076c2a8-354f-430b-a2ae-33d68ce2ebca/94616716274.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d2c9274-a287-46de-8927-6918ba0a2385/pi_to_pi_star_transition_definition.pdfIn PDF document text
    • https://52431b39-7396-4b0c-bcaf-ab72d449a1bf.filesusr.com/ugd/f8cef3_3c96d33a61b94534ae9dbfb2f55f5be9.pdf?index=trueIn PDF document text
    • https://14864a69-2465-45da-a912-c6f78a3f99b9.filesusr.com/ugd/409ca8_889a300f8ecd4edc93c6d6fbe53f130b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3a4a3c8-189a-4a1f-93dc-d30b63587824/towofowibowunimebuvaze.pdfIn PDF document text
    • https://0d60ad6b-4335-46df-a7d3-c4b0b779bc1e.filesusr.com/ugd/974a4e_f49c29f6f3f34d309b92366609552eab.pdf?index=trueIn PDF document text
    • https://c03439ef-6557-4199-865e-586791a52b6c.filesusr.com/ugd/6bb4a2_699d21dbac1e48feb6742a1fe6a339fe.pdf?index=trueIn PDF document text
    • https://2ed821ec-8078-4e74-b11b-c5cec6a88262.filesusr.com/ugd/65e777_e9aaec56329b4df9b03f15c700f30242.pdf?index=trueIn PDF document text
    • https://69f1164a-dcd3-4310-9fb4-3b67f03bdbb0.filesusr.com/ugd/9d7282_8e50c3e27dac4bc2ad7c59c57fc1de74.pdf?index=trueIn 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_off0001215c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1215C 5656 bytes
SHA-256: 45ee6dac3521c07c4863ccb3746aa07dd77d6098a6fe118d572b21b9ab46dbb8
font_01_sfnt_off00013474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13474 13848 bytes
SHA-256: 9d09dd2c2f82a560c20743932aedc1d16f10484ce7c3146bdcfb6981e54e95b3

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