Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2b0c7f7ccedd53f…

MALICIOUS

PDF

89.0 KB Created: 2021-03-03 13:01:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5a5aa42c31f69ac0cd3ed02d483b6512 SHA-1: 9a10257fa6e0544383399ba5822ed7098843d574 SHA-256: c2b0c7f7ccedd53f6a95be7f3800d45007b0e7e04ed10e7ab807fb04daad57ba
186 Risk Score

Malware Insights

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

The PDF document impersonates Amazon, a critical finding indicating a credential phishing attempt. It contains multiple external URIs, including one pointing to a link farm on disposable hosting and another to a Weebly-hosted PDF, both likely part of the phishing infrastructure. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing trojan.

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
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://xibabajawaxas.weebly.com/uploads/1/3/1/3/131398380/3100f0db3a1.pdf.
  • 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://dugedepap.ru/wix?keyword=big+ideas+math+geometry+chapter+11+review+answers PDF link annotation
    • http://minomesiguziv.22web.org/55410575452.pdfIn PDF document text
    • https://xibabajawaxas.weebly.com/uploads/1/3/1/3/131398380/3100f0db3a1.pdfIn PDF document text
    • http://rababugizegir.22web.org/french_term_for_dish_of_the_day.pdfIn PDF document text
    • http://bomufofo.iblogger.org/nugav.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375703/normal_6004069eeb3bd.pdfIn PDF document text
    • http://copyrightshelpcenter.com/voponagaterixovokobrigpi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369520/normal_6033c0438a75a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389576/normal_5fe66eaf66136.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dedetepejoxele.epizy.com/zetubuvumeparolugewusot.pdfIn PDF document text
    • http://zadiken.rf.gd/mountain_bike_size_guide_wheels.pdfIn PDF document text
    • http://mekamaxabojumoz.epizy.com/60768068585.pdfIn PDF document text
    • https://s3.amazonaws.com/muxozuvalubi/construction_contracts_act_payment_claim_template.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_off00011b2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2A 5808 bytes
SHA-256: dd885ed4a7941dfbb0106764031435fda613740faf503b406a823c70516c96d2
font_01_sfnt_off00012eef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EEF 11796 bytes
SHA-256: 80459f3f1287335aa012c13d54789c3ea551336399d5fb17751bba18921c2bee

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