Malicious PDF — malware analysis report

Static analysis result for SHA-256 85ee1e9cf16bb9d8…

MALICIOUS

PDF

96.3 KB Created: 2021-03-24 02:17:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 9d368a60cf33b7d14dc027593a2ebfcc SHA-1: 99d22851a983bb73077aba7f2a64fa8225470a98 SHA-256: 85ee1e9cf16bb9d8cad90ff5435df4590fd0da5e39251c9ad7e68df62d9bc2d6
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 hosted on disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ponafet.ru/award?keyword=alimentos+antioxidantes+naturales+pdf PDF link annotation
    • http://vafefenovabire.22web.org/kipopizogaberux.pdfIn PDF document text
    • http://sozaxesugoj.mywebcommunity.org/bedinemigefopir.pdfIn PDF document text
    • http://ximamigi.iblogger.org/tigegut.pdfIn PDF document text
    • http://vapurese.22web.org/36352608868.pdfIn PDF document text
    • http://ferabugajefelam.mypressonline.com/24290975619.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://wekolururedil.rf.gd/63375405155.pdfIn PDF document text
    • https://45ed8376-e832-497f-ab20-0a31924dc5db.filesusr.com/ugd/4b7290_bf1c409dca7346e3bf2f7c59815679c9.pdf?index=trueIn PDF document text
    • http://bekabugi.epizy.com/wizard101_tartarus_gear_guide.pdfIn PDF document text
    • https://4be8a7ba-6c9a-47a4-99fc-a5961b41a404.filesusr.com/ugd/132250_2744cf21ef3c4b84b094b47fa4bf7159.pdf?index=trueIn PDF document text
    • https://f395d2f2-f939-483b-815f-81062d4747ff.filesusr.com/ugd/be2697_547652061de540bd83d5b6f46d50b4cf.pdf?index=trueIn PDF document text
    • https://5ee0d2ad-6486-47ce-ab7d-0e7b2bae4193.filesusr.com/ugd/bc0d1e_cb409629b20c41e09d7fc037dda0405a.pdf?index=trueIn PDF document text
    • https://923a8ca3-316b-4844-b38f-9bc955ad4852.filesusr.com/ugd/312e0e_ea40624291a14110a22d697fbaeca998.pdf?index=trueIn PDF document text
    • https://5f8b0e40-2141-4341-98ab-6145db4b8156.filesusr.com/ugd/2072cd_922edf6df23c4a7b8015118b801605a3.pdf?index=trueIn PDF document text
    • http://bopevevene.epizy.com/burlington_nc_pd_accident_reports.pdfIn PDF document text
    • https://02274cc9-8b57-4441-be19-e46c089ec46b.filesusr.com/ugd/f11b8f_a1d8970b4af64f6f9292455bc2165ed6.pdf?index=trueIn PDF document text
    • http://jabenesejamuji.rf.gd/how_to_disable_alarm_without_key_fob.pdfIn PDF document text
    • https://4095172d-bd2f-4181-91d7-dd424e653400.filesusr.com/ugd/df73ab_137a3fa66a004812954b9aefa70b4a92.pdf?index=trueIn PDF document text
    • https://db22a0a0-c6c8-4eb9-9878-037c50d93224.filesusr.com/ugd/e2b5b3_e4990194b0fb4a92ba8f53f4e43601a0.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012b38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B38 5128 bytes
SHA-256: 1d845edb13249791e9680a1aa090b947d6f51ae4657f0e04003c45073df62fb8
font_01_sfnt_off00013c87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C87 12124 bytes
SHA-256: 627f0f93f902ffcada6c0e95a83f580de2f94870504b38813e587ba7091b1c5a
font_02_sfnt_off000163bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163BB 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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