Malicious PDF — malware analysis report

Static analysis result for SHA-256 d638f52271e7d540…

MALICIOUS

PDF

77.2 KB Created: 2021-02-13 14:53:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: c325af1cd736a6af93d91190b60dcaba SHA-1: d043feb030c0b31705a86d6d35221d849e71588d SHA-256: d638f52271e7d540592fb1d7ca4035f57512a8d8f3a29c9b90bead95462cb7b0
246 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO abuse tactic. The heuristic 'SE_BRAND_CREDENTIAL_PHISH' specifically identifies a UPS impersonation lure pointing to a redirector URL. The ML classifier and ClamAV detection further confirm its malicious nature, likely as a credential phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://pigixona.weebly.com/uploads/1/3/5/9/135986477/wibow.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://bologen.ru/infin?keyword=barriers+to+trade+worksheet+answers PDF link annotation
    • https://cdn.sqhk.co/kugugofawaz/idAGani/96103313975.pdfIn PDF document text
    • http://rotepojisox.iblogger.org/core_java_written_exam_questions_and_answers.pdfIn PDF document text
    • https://pigixona.weebly.com/uploads/1/3/5/9/135986477/wibow.pdfIn PDF document text
    • https://debivozujorebol.weebly.com/uploads/1/3/0/8/130813616/9ac5418f.pdfIn PDF document text
    • https://konomotawet.weebly.com/uploads/1/3/1/3/131379362/voxovixaxa_polovosa_lubuzekami_veditawovev.pdfIn PDF document text
    • http://xekinivafu.iblogger.org/96104531428.pdfIn PDF document text
    • https://ginuwawabesinu.weebly.com/uploads/1/3/1/1/131164414/zebedoxater.pdfIn PDF document text
    • https://jikufowawuful.weebly.com/uploads/1/3/2/8/132814232/2044913.pdfIn PDF document text
    • https://cdn.sqhk.co/xeduwukaxusa/9ikhevE/vusufuruwosagozepozezi.pdfIn PDF document text
    • https://cdn.sqhk.co/rigizisojix/hIxphew/spacewar_steam_stats.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460228/normal_5fe8939b52ef0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379602/normal_5fe7626216649.pdfIn PDF document text
    • https://cdn.sqhk.co/karapenakozi/ijjhRzK/dmv_traffic_accident_report_online.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386076/normal_5ffc81ff98ef8.pdfIn PDF document text
    • https://voxesisa.weebly.com/uploads/1/3/4/3/134349259/xitodiviza.pdfIn PDF document text
    • https://sugelazo.weebly.com/uploads/1/3/4/7/134767002/mudemovedu_riromujegawodo.pdfIn PDF document text
    • https://wemezixogasowed.weebly.com/uploads/1/3/1/6/131637562/8575804e76ea49.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zotapem.rf.gd/wafeturepavopamododaxef.pdfIn PDF document text
    • https://s3.amazonaws.com/rexogeguxosix/hive_mind_stellaris_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/sazomo/transformers_movie_autobots_characters.pdfIn PDF document text
    • http://zukegavodobuxas.epizy.com/rakasobobosaxoligol.pdfIn PDF document text
    • https://s3.amazonaws.com/minabiwa/24586048917.pdfIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/android_emulator_iphone_2018.pdfIn PDF document text
    • http://gedijusopekud.epizy.com/4liker_1._0_android_apk.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_off0000f34a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34A 5084 bytes
SHA-256: 75268bbc3da32d4fd88a58db8a8f715db88a37efa4a93f8506e8b5897cb45326
font_01_sfnt_off000104a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A1 10112 bytes
SHA-256: 0a90ec15c4d4e67c500444d8db0bf621e6b127a0e52c705feaae7b1af2c5e305

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