Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3ddb186d72aaaf9…

MALICIOUS

PDF

74.7 KB Created: 2021-03-05 23:47:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 7b8ea7ac4e4f20047ee4559fed2f9f4a SHA-1: 8e3442f7bf0377c67697aa0c4aa51910fe01ce25 SHA-256: f3ddb186d72aaaf927d30be3bd7d3f71d628130acb6bcdb4f88c9d3f6676a04f
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by multiple heuristics and a machine learning classifier. It contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The primary IOC is the initial URL which includes a search term, suggesting a potential lure for users searching for specific products.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://nipisod.ru/strik?utm_term=craftsman+625+series+lawn+mower+oil PDF link annotation
    • https://dobuxodujunov.weebly.com/uploads/1/3/2/7/132741154/e97894fb51d2.pdfIn PDF document text
    • https://retetozatinum.weebly.com/uploads/1/3/0/7/130775023/berew.pdfIn PDF document text
    • http://a1metromovers.com/where_did_the_song_yankee_doodle_dandy_come_from15mng.pdfIn PDF document text
    • http://rimaliwem.iblogger.org/vamifiwitugamumik.pdfIn PDF document text
    • https://tivizaxif.weebly.com/uploads/1/3/1/3/131381605/9784216.pdfIn PDF document text
    • https://dawerofe.weebly.com/uploads/1/3/4/3/134361643/d246ec5f21ada.pdfIn PDF document text
    • https://novufetus.weebly.com/uploads/1/3/4/1/134131343/7d9b8.pdfIn PDF document text
    • http://mylic.ru/posumesarazadizupnxjz.pdfIn PDF document text
    • http://biomaniix.website/kalender_2020_cdr_gratisbozfk.pdfIn PDF document text
    • https://gogukosujupubof.weebly.com/uploads/1/3/5/3/135317205/palizatexalonop.pdfIn PDF document text
    • http://kiwaliguza.iblogger.org/10784462955.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jigiwema.epizy.com/dumukaso.pdfIn PDF document text
    • http://felawikemuda.epizy.com/pizukexonamugu.pdfIn PDF document text
    • http://wuwepapose.epizy.com/the_blade_itself_audiobook.pdfIn PDF document text
    • http://wowimes.epizy.com/java_interview_questions_and_answers_for_testers.pdfIn PDF document text
    • http://rolaxaja.rf.gd/nice_guidelines_pregnancy_and_exercise.pdfIn PDF document text
    • http://vilewol.epizy.com/41801384453.pdfIn PDF document text
    • http://sukidagijonola.rf.gd/98965766663.pdfIn PDF document text
    • http://jolopegewedagil.epizy.com/club_car_xrt_1550_service_manual.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_off0000e796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE796 5320 bytes
SHA-256: 23414d00d06a852e09068ef4f7fede486b2a4f57e2c576d6f23911f436bbad57
font_01_sfnt_off0000f9ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AD 10468 bytes
SHA-256: 9492e5039994d24a83392725a6ae4c71341726fed4fa9068c426e1f768929e35

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