Malicious PDF — malware analysis report

Static analysis result for SHA-256 91677e83880950e9…

MALICIOUS

PDF

83.9 KB Created: 2021-03-16 17:12:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 306f9d76f9a87588b31429995ac465c2 SHA-1: 4e79884b6215641ce073b60f23339d2785bc065c SHA-256: 91677e83880950e97d1269001ce64276acd3aadbc1ca4ec0d0cd2f447b24d2bc
126 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with one prominently featuring 'construction site visit report format pdf' in its query string, suggesting a phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards a phishing campaign designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 5

  • 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 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://midufefew.ru/strik?utm_term=construction+site+visit+report+format+pdf PDF link annotation
    • http://freefire-gifts.com/unequal_childhoods_chapter_8_summarysnv74.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481509/normal_60225c3b24faa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494875/normal_5fe779b1e1181.pdfIn PDF document text
    • http://wetitafege.iblogger.org/78723057960.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479212/normal_5ff99613b8f05.pdfIn PDF document text
    • http://bullbananavannaone.xyz/16253323325m76ac.pdfIn PDF document text
    • https://juwarojolajekol.weebly.com/uploads/1/3/4/1/134108785/lifokiwojenet.pdfIn PDF document text
    • http://discovljzg.fun/what_effect_does_cooking_have_on_enzyme_activityer33z.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490547/normal_5fec0c2688faf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464542/normal_603e938900869.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443814/normal_6003756db237e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467273/normal_5fc93b3153fc1.pdfIn PDF document text
    • https://dizogesutupini.weebly.com/uploads/1/3/4/6/134631076/guwero.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427809/normal_5fca1fe8725e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418367/normal_604ec3e8929ab.pdfIn PDF document text
    • http://bunnygummy.ru/sokipevaperxk4cj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459776/normal_604fd07be0a06.pdfIn PDF document text
    • http://haifaiv.ru/xoxadowujijabotujh47wr.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kabutusagop.rf.gd/caterpillar_annual_report.pdfIn PDF document text
    • https://s3.amazonaws.com/sojaxub/rejaxutidojumejid.pdfIn PDF document text
    • http://sawopirorafo.rf.gd/android_file_transfer_command_line.pdfIn PDF document text
    • http://zijubeda.rf.gd/operating_system_concepts_9th_edition_powerpoint.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxomigo/7874104924.pdfIn PDF document text
    • https://s3.amazonaws.com/wakuzidi/funalixeretajomitufenip.pdfIn PDF document text
    • https://s3.amazonaws.com/wejuvono/watercolor_flowers_png.pdfIn PDF document text
    • https://s3.amazonaws.com/fupanabivote/10790456488.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10402 1696 bytes
SHA-256: 9a98723dae936e7c7c8d502cfbcf27bf9f93cff28ba6a06675a6a95244fbc4de
font_01_sfnt_off00010c2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2C 5236 bytes
SHA-256: fa4638666aea9ea09efe7044eb360f3c6ffc10582b5c9e508da130d58cc612ec
font_02_sfnt_off00011de8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE8 10412 bytes
SHA-256: 387dcce06ec16f2006c186da22548c68d621709f9213fe671ba490352a12e85f