Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad865ddae31cf4bf…

MALICIOUS

PDF

90.7 KB Created: 2021-04-07 23:03:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa724700c76fed3489d95758ceb5b46e SHA-1: 7ad2bcb81d413bcad1233ae7582fd8b06f703761 SHA-256: ad865ddae31cf4bf8d76f15d092dd3fc5c34c378e2c17e8cfd7157d982d10874
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to disposable hosting, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malicious redirection scheme, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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
  • 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/123?utm_term=comprehension+aptitude+test+questions+and+answers
    • http://semengergel.ru/15080754629s6nst.pdf
    • http://sreda.city/45160828664zq6b6.pdf
    • https://cdn.sqhk.co/fowipovoji/ogejchj/35308204935.pdf
    • https://cdn.sqhk.co/wovupeni/hdgchdJ/free_online_music_radio_no_commercials.pdf
    • http://love-cosmetics.shop/watch_star_wars_the_last_jedikzlab.pdf
    • https://cdn.sqhk.co/devisofage/igUqrhc/airport_airlines_air_traffic_control.pdf
    • http://esclub.pro/28696578088nch5w.pdf
    • http://ledimpress.biz/indiskie_filmi_na_russkombago8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://23fe9111-5aa3-4288-b7a4-a84c242bb647.filesusr.com/ugd/d35b85_f42a2089780b4994a0ab6bdfdbc2f855.pdf?index=true
    • https://s3.amazonaws.com/gurupixabogivaz/common_sense_thomas_paine_questions_and_answers.pdf
    • https://s3.amazonaws.com/kosipefojaw/mathematics_problem_solving_strategies.pdf
    • https://fc59733d-949e-4df9-817b-fea2515c5cc7.filesusr.com/ugd/689329_6bdeae0272d34bb2b40b8e27bb6441ca.pdf?index=true
    • https://951e66c5-660f-4748-bfcc-a6cc0831133d.filesusr.com/ugd/4967bb_2c3809160c884d50ac7bb75e872634c0.pdf?index=true
    • https://46c19374-600d-43be-a5f2-d8bf07c6fddf.filesusr.com/ugd/cc94a4_6390ada9ba7f4bb3815fc7fd000e0f28.pdf?index=true
    • https://6a24fdd2-d4a5-4c4b-882b-0f3115751bcf.filesusr.com/ugd/04e6f9_866294eb10684728b86b0f3f8beb381e.pdf?index=true
    • https://69669160-cc20-42a3-bfef-e1e1fd1f8163.filesusr.com/ugd/8094a4_a4711cb780804bcf83a31f92f3daebea.pdf?index=true
    • https://s3.amazonaws.com/desenaz/dofupigomuguxawim.pdf
    • https://6648aa49-deb3-4d6f-81a8-a63cc7a297fb.filesusr.com/ugd/38eac1_301d2d3754e14a4981bc10c25d65baef.pdf?index=true
    • https://95049c82-e412-4913-a0b0-e03e83d5170a.filesusr.com/ugd/127d6e_66595f5b63ec47d18ff2079cfabee6a3.pdf?index=true
    • https://2a4c341d-9af7-4f89-b48a-1b926ad6ced7.filesusr.com/ugd/dd6616_e868a23a1d6349ffa2d0909288454154.pdf?index=true
    • https://d7301f0f-9730-4f6e-9d95-601e203cb770.filesusr.com/ugd/253413_5284368be89e4ce6a17e8fa8e37450ec.pdf?index=true
    • https://6d23287f-a15b-43b7-8d69-700c0e01f504.filesusr.com/ugd/185c00_5af43c47185f456b8f6601e658d21349.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011732.bin
ed12e71008a4b7fbf9e7b9e19a9571e9007845364ea2ae6a852192d56c64ec21		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11732 5292 bytes
font_01_sfnt_off0001290f.bin
53166f2f739a96fcbf2ab432701d35d982a7e6f1e7f4efda18bbe6fd5ef02ee2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1290F 11320 bytes
font_02_sfnt_off00014f15.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14F15 4324 bytes

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