Malicious PDF — malware analysis report

Static analysis result for SHA-256 35a39dade7286a61…

MALICIOUS

PDF

72.8 KB Created: 2021-06-07 04:49:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 6fb2b5d9e6aa1826225a847c96f252ea SHA-1: 56a519cf3f00c2f454b12ab89f4997fadadab2ab SHA-256: 35a39dade7286a6195de21d40ae8dd44e618dab637ba4912f3fc8af2967f2a0a
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://cructi.ru/pbw?utm_term=free+resume+maker+cv+maker+templates+formats+app PDF link annotation
    • https://lodufokokafapav.weebly.com/uploads/1/3/5/3/135346761/wuxonupitidaf_kaliligozakifa_jixija_sikosusufu.pdfIn PDF document text
    • https://wirejosesem.weebly.com/uploads/1/3/1/8/131856641/6199762.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468551/normal_6016ebf2438a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403141/normal_6039fc127fd7d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408719/normal_604b21a3a80d2.pdfIn PDF document text
    • https://bulurumuz.weebly.com/uploads/1/3/1/1/131163623/vopafakova.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403143/normal_606043480e19c.pdfIn PDF document text
    • https://ledifufopore.weebly.com/uploads/1/3/4/5/134524185/7680327.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452398/normal_601a7d7118f00.pdfIn PDF document text
    • https://xajomorunineg.weebly.com/uploads/1/3/1/3/131383441/5068996.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368266/normal_5fda696d11db3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zeratuwolima.pbworks.com/w/file/fetch/144536361/40203746311.pdfIn PDF document text
    • http://sawanixum.pbworks.com/w/file/fetch/144521466/job_offer_letter_from_employer_to_employee_australia.pdfIn PDF document text
    • http://mevuteled.pbworks.com/f/xudebumiferamanumewoxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57cae370-12ab-4f3e-89e3-d964cc1c8f77/sat_test_dates_2020_locations.pdfIn PDF document text
    • http://risoxef.pbworks.com/w/file/fetch/144444831/46338492183.pdfIn PDF document text
    • http://jolowajuwijo.pbworks.com/f/pusubugosox.pdfIn PDF document text
    • http://pusavivo.pbworks.com/f/66224709116.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc258f90-ff2d-4654-a3c4-b9d6158212f7/blade_mlp4dsm_4ch_transmitter_manual.pdfIn PDF document text
    • http://pobonagul.pbworks.com/f/greek_and_latin_root_words_worksheets_5th_grade.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_off0000ddeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEB 5240 bytes
SHA-256: 0f0cdc4b42a920a50fe516af6c6226a14f769cb7b1d359a8be5ff507dd297392
font_01_sfnt_off0000efb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB4 11212 bytes
SHA-256: 14046e3a35651fa479e0939898206f32038889d9ae063edfb11e3eb43f58c18c