Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d1fd57dd0e3514d…

MALICIOUS

PDF

79.0 KB Created: 2021-03-18 09:44:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2201e7a947bd45b1a66e7f524f8c8f0c SHA-1: ba6455525fb5ffa7ed4b80773ff931d5ac984986 SHA-256: 4d1fd57dd0e3514de66b675818def3aac95cd1b64b78223f9cd503e2dff9b61e
156 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 'PDF_SEO_LINK_FARM' heuristic, suggesting a phishing or malware distribution campaign. The primary URL, 'https://xezojetit.ru/award?keyword=business+development+manager+jd+pdf', is presented as a job description, likely to entice users to click. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. No scripts were extracted, but the presence of numerous external links points to an initial access vector via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://xezojetit.ru/award?keyword=business+development+manager+jd+pdf
    • https://bimidofun.weebly.com/uploads/1/3/4/4/134460432/3069377.pdf
    • https://wobanuwu.weebly.com/uploads/1/3/5/9/135959505/5059658c76.pdf
    • https://soberonapi.weebly.com/uploads/1/3/2/6/132681790/zekojabafositit.pdf
    • https://salovunuwav.weebly.com/uploads/1/3/0/9/130969923/bumov.pdf
    • https://jukawowirorab.weebly.com/uploads/1/3/4/6/134662443/5c545e99ca2881d.pdf
    • http://kazerurido.iblogger.org/29590883223.pdf
    • https://jedifubebevaze.weebly.com/uploads/1/3/4/8/134873515/zovef.pdf
    • https://pibemalogodozod.weebly.com/uploads/1/3/2/6/132681910/sezenuwabavofamu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/931a077d-33c0-48b8-b1b2-8106dcb2b49c/tugagafe.pdf
    • https://6376acfe-5884-4251-b3d5-19a03c044549.filesusr.com/ugd/de3d83_75cba3df6411451e916a6c2310e6cb58.pdf?index=true
    • https://s3.amazonaws.com/liwafo/libro_bacteriologia_clinica.pdf
    • https://s3.amazonaws.com/rizezobabub/42136121399.pdf
    • https://08c3cc13-1ce0-4add-927e-a3aed263473e.filesusr.com/ugd/ccf397_acaf085a23d442d4b1f89407a498b4cc.pdf?index=true
    • https://e85625e8-91d5-48c2-95a4-67b7b95d5b39.filesusr.com/ugd/b97a97_e922d91134a747a69cf9bfca0e02c517.pdf?index=true
    • https://s3.amazonaws.com/lurutopobi/51504110656.pdf
    • https://uploads.strikinglycdn.com/files/e607d65b-5013-4258-af91-362c381ec138/lifonefavuguxekufalo.pdf
    • https://c7fb3737-a2fb-4e06-b71d-f78b648bb0a4.filesusr.com/ugd/a9248e_b06a4abce9b44aee91f7793832026bb0.pdf?index=true
    • https://667abc8f-92ca-45d9-bc9d-789c80a68858.filesusr.com/ugd/dcd78f_1c5ae3d01d10426fbd4d567e3d23afab.pdf?index=true
    • https://uploads.strikinglycdn.com/files/30f2aff9-ecd5-4654-a799-e7eb3a467cbd/6550569293.pdf
    • http://jemavavobeziv.epizy.com/handboek_appreciative_inquiry.pdf
    • https://uploads.strikinglycdn.com/files/a81df399-3d18-4967-8b9a-6055acc1ead6/elkay_drinking_fountain_replacement_filter.pdf
    • http://kefixofelapadi.epizy.com/ft-847_cat_control.pdf
    • https://uploads.strikinglycdn.com/files/48aa712e-eb11-4817-96ed-157e4ff5868f/how_do_you_prepare_for_lacrosse_tryouts.pdf
    • 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_off0000f6c9.bin
e95c3f8166798170fec6d0a235fadd04a6a014b0a7c1499b751f738ea89996b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C9 5544 bytes
font_01_sfnt_off000109a3.bin
a9ecdf1179c8ee0750bcabd020d88ccc0e6e4eb2b86659e04c9527118099b4fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109A3 10832 bytes

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