Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca59096dc81692b9…

MALICIOUS

PDF

79.9 KB Created: 2021-02-09 20:53:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 40a334abf4b0de1b791fe35f57d2ed18 SHA-1: 5d7cb795ca29112c51ed4e0779b9994e4f143989 SHA-256: ca59096dc81692b9c33e2ae9d4df6c7a5314cafa8e0ccfb60fc8e0a83f1424d4
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, indicating a link farm designed to direct users to potentially malicious content. ClamAV and ML classifiers identified this PDF as malicious, specifically a phishing trojan. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution attempt, likely initiated via spearphishing.

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://jottigo.ru/wb?keyword=my%20sheets%20are%20clean%20in%20spanish PDF link annotation
    • https://cdn.sqhk.co/zodenizekija/ijghigo/26651489377.pdfIn PDF document text
    • https://bipozoxadedisaj.weebly.com/uploads/1/3/1/1/131164124/2d8ec4917b65173.pdfIn PDF document text
    • https://nubizuvilokimid.weebly.com/uploads/1/3/5/4/135401099/gulunu.pdfIn PDF document text
    • https://pasojifet.weebly.com/uploads/1/3/0/7/130776368/de02d8ff26e.pdfIn PDF document text
    • http://xuxisozolawub.22web.org/polar_form_to_cartesian_form_examples.pdfIn PDF document text
    • https://lorerepurukese.weebly.com/uploads/1/3/1/4/131453396/wesonasakutoza.pdfIn PDF document text
    • http://wagikopegufiza.66ghz.com/jnc_10_hypertension_guidelines.pdfIn PDF document text
    • https://gatepeduvemixif.weebly.com/uploads/1/3/4/6/134669895/vixovekezera-nexudiritofus.pdfIn PDF document text
    • https://resodarapasak.weebly.com/uploads/1/3/4/6/134659305/fezavotana.pdfIn PDF document text
    • http://revujutipisan.22web.org/56140669224.pdfIn PDF document text
    • https://jifalutisapore.weebly.com/uploads/1/3/4/7/134772579/gotatadema-ximamuxupanikof.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/sepawi/23356626118.pdfIn PDF document text
    • http://kixixiwibatogit.epizy.com/free_chili_cook_off_voting_ballot_template.pdfIn PDF document text
    • http://fefekug.rf.gd/brezza_car_images_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/gifiz/78125652761.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_off0000fa36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA36 5128 bytes
SHA-256: f6e29329dde0841332be63e62210d0ec8432ad49f04b5762e144c21a2eef3810
font_01_sfnt_off00010bb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB9 11272 bytes
SHA-256: 628a48e037de3705506dbac85a760e3d47bc3716f9984e51ccc4ace90a79b9a7

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