Malicious PDF — malware analysis report

Static analysis result for SHA-256 6785d1ed0004cbce…

MALICIOUS

PDF

105.4 KB Created: 2021-03-17 17:04:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: eb620bbe7dcac35655c9d88469e4eeb9 SHA-1: 9a9d77f235c65fd8ef4ca62664e33c7f5971962e SHA-256: 6785d1ed0004cbcecb819d19f63c2c0fdd479c86c6347a2743fe195fa230f667
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, a common tactic for link farms designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. The primary external URL identified is https://gimoguvi.ru/strik?utm_term=was+hercules+with+jason+and+the+argonauts.

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://gimoguvi.ru/strik?utm_term=was+hercules+with+jason+and+the+argonauts PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4452400/normal_5fc5c7e33e42f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482863/normal_5fc78ccdc92e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384310/normal_60265a076562a.pdfIn PDF document text
    • https://pokumajapemen.weebly.com/uploads/1/3/4/4/134490217/02cb040e5a53.pdfIn PDF document text
    • https://tawusizigegik.weebly.com/uploads/1/3/3/9/133997505/5869048.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444869/normal_6046cabdd98e4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5053e88e-9e18-4719-890c-32a1cca0295d.filesusr.com/ugd/411503_8e9c681fc30f428f90a3c038301b1f45.pdf?index=trueIn PDF document text
    • https://99516632-72ce-40f3-a9a1-a01c91361c65.filesusr.com/ugd/e42c35_745c911c1ad4466b8dbd6a36020507f6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/purixifusipelid/roledefibuwalamuxu.pdfIn PDF document text
    • https://591e60e9-54e8-4b06-a9a7-f2e0522969d0.filesusr.com/ugd/1fd4b7_63693fd260b249d4949339e8514c110a.pdf?index=trueIn PDF document text
    • https://2a4065d7-883d-43e8-a524-7ce9aa4b4e88.filesusr.com/ugd/ccb1c6_677e8d48b3094220908557790599eabd.pdf?index=trueIn PDF document text
    • https://eed7fa7e-4f31-4ba6-8269-e73f07ac74c5.filesusr.com/ugd/93374d_145f52609a354f3eaf113a76441d0720.pdf?index=trueIn PDF document text
    • https://275320ff-96dd-455a-9699-a0fdc58b27a5.filesusr.com/ugd/943725_a4f6b57cbc794b3b9aa1f2cbbeb05473.pdf?index=trueIn PDF document text
    • https://2c9641c8-5874-4869-9b94-f1378e60aa6b.filesusr.com/ugd/efc1f6_3e8b8646a9d048ac8fcda34ed48f3244.pdf?index=trueIn PDF document text
    • https://aefbb2f1-1cfc-4a48-aab2-d72547d84173.filesusr.com/ugd/2f3ac6_b6d02aeb70ec4cd1b81aceacdd466dc7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jedobufudajewu/characteristics_of_b_form_of_dna.pdfIn PDF document text
    • https://11484d69-1612-41b9-9199-165df1f08223.filesusr.com/ugd/e2f197_bfe4a23519da48d7a78b0d4e54832a05.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/juzowilipi/how_to_use_a_maytag_bravos_xl_washer.pdfIn PDF document text
    • https://s3.amazonaws.com/jigezilor/phonetic_symbols_chart.pdfIn PDF document text
    • https://28546a20-d0cc-4b82-bb4f-6711990cd5a3.filesusr.com/ugd/0bcf16_64fcbca671034282963e897d3b76f104.pdf?index=trueIn PDF document text
    • https://17673d3b-e5d0-4e0e-8211-f079fadf35f5.filesusr.com/ugd/13ae68_351ee0c2d5bc4500bae80095492e40ac.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_off00015e91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E91 5384 bytes
SHA-256: 7eafc85160eecdc9efe5b83546c0c5a76fd68f1d11bd6d1e6c76cb92eab9fdf2
font_01_sfnt_off000170f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170F5 11828 bytes
SHA-256: e75339bafbbc35d3b8402f88c2fd555fae737f3c2dbc01207ef6753101aacaec