Malicious PDF — malware analysis report

Static analysis result for SHA-256 c16934078a34e04b…

MALICIOUS

PDF

74.1 KB Created: 2021-02-25 17:36:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: bcbad277848bceddf58d96fec90e38f4 SHA-1: 92b35b5abf1f036774e89c9a26f87560a2398998 SHA-256: c16934078a34e04b28ff1f59a4b3726071726b2402ec2fac86f4baec5ba30342
244 Risk Score

Malware Insights

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

This PDF document is identified as malicious by multiple heuristics and a machine learning classifier, indicating it's likely a phishing or spam lure. It contains a large number of embedded links pointing to various disposable domains and link farms, designed to redirect users to potentially harmful content. The presence of a link to a redirector infrastructure further supports the malicious intent.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=how+to+reset+netgear+wnr2000+v3 In PDF document text
    • https://jabibodusap.weebly.com/uploads/1/3/2/6/132681053/30da312713.pdfIn PDF document text
    • https://fenipedixov.weebly.com/uploads/1/3/5/3/135385823/ece0971537.pdfIn PDF document text
    • https://xewixubigikuj.weebly.com/uploads/1/3/4/8/134892453/tirunolilowu.pdfIn PDF document text
    • https://lobodilogiji.weebly.com/uploads/1/3/1/3/131382226/leketuwuzum-kuxatat-figinerodoted-suwuwufer.pdfIn PDF document text
    • https://takijotirodone.weebly.com/uploads/1/3/1/6/131637658/logunumijigu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368497/normal_600aaef56cbe6.pdfIn PDF document text
    • https://datugabow.weebly.com/uploads/1/3/4/7/134745554/golebajowojivizurutu.pdfIn PDF document text
    • http://ogranicbio.space/karakai_jouzu_no_moto_takagi-_san7vbdk.pdfIn PDF document text
    • http://verifybadgehelp.com/63955535727g32bt.pdfIn PDF document text
    • https://wutodifutatur.weebly.com/uploads/1/3/2/8/132814097/9446216.pdfIn PDF document text
    • http://padlamadla.site/common_english_words_pronounced_wrongyyp5d.pdfIn PDF document text
    • https://cdn.sqhk.co/kekumumaxow/3EjgPjd/a_smile_is_beautiful.pdfIn PDF document text
    • https://rabofabi.weebly.com/uploads/1/3/0/8/130813834/27da3.pdfIn PDF document text
    • http://kawlites.online/jerizulisew59oj8.pdfIn PDF document text
    • http://endi-itali.space/broken_heart_quotes_images_freekjsbj.pdfIn PDF document text
    • https://jelakuge.weebly.com/uploads/1/3/1/8/131856802/6937543.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375353/normal_602d935ddb825.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/varoximu/tewesatowifojusunuf.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagobomap/jebibazolatu.pdfIn 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_off0000e487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE487 5372 bytes
SHA-256: 963eadd85e8de84c75c921f3ca268456d3c3cc0c7f707354f71e8d7dc57e260f
font_01_sfnt_off0000f6f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F1 10492 bytes
SHA-256: 97c3e5134f5841bf07e72071f964d511663a6f64913fb278132d9f90603f8db6

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