Malicious PDF — malware analysis report

Static analysis result for SHA-256 4020d3c1a57af1b6…

MALICIOUS

PDF

78.8 KB Created: 2021-05-23 07:51:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: aa77ad0d478fa3eb1f92668c4d63d7c2 SHA-1: 7815e5a03153300f4d94f0dc6913e37647ff2989 SHA-256: 4020d3c1a57af1b60bb23a240de93a227e5e333735c055d4ea3097ff8e08cffd
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to various external PDF files hosted on disposable domains, likely as a phishing or malware distribution lure. The embedded URLs and the document body suggest a pretext of providing movie download links to entice users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://bologen.ru/strik?utm_term=jeepers+creepers+2+720p+dual+audio+movie+download PDF link annotation
    • https://mitanifujokuvu.weebly.com/uploads/1/3/0/9/130969645/3048fc67a8116.pdfIn PDF document text
    • https://tajagarajoj.weebly.com/uploads/1/3/0/7/130776182/xibisogafivafo.pdfIn PDF document text
    • https://vavaxomutiposev.weebly.com/uploads/1/3/0/7/130738712/lulorerozera-mololefog.pdfIn PDF document text
    • https://kiriwalukejogof.weebly.com/uploads/1/3/4/3/134310578/89ae911a041917e.pdfIn PDF document text
    • https://mufusudakewita.weebly.com/uploads/1/3/2/6/132681672/3747641.pdfIn PDF document text
    • https://koterevimudo.weebly.com/uploads/1/3/4/3/134342185/2405425.pdfIn PDF document text
    • https://kirasupi.weebly.com/uploads/1/3/4/4/134442552/xogiluxedog.pdfIn PDF document text
    • https://rewazute.weebly.com/uploads/1/3/4/6/134648352/605d7c1b9.pdfIn PDF document text
    • https://geguwuwivoloko.weebly.com/uploads/1/3/1/6/131636947/nabalifiroj-tewewibanu-jaziloropafi.pdfIn PDF document text
    • https://fibigator.weebly.com/uploads/1/3/4/3/134313363/6540901.pdfIn PDF document text
    • https://bukalabak.weebly.com/uploads/1/3/4/4/134488518/vepigeri.pdfIn PDF document text
    • https://sovinupuni.weebly.com/uploads/1/3/4/7/134762808/1894140.pdfIn PDF document text
    • https://xibagepop.weebly.com/uploads/1/3/1/4/131438114/052d0.pdfIn PDF document text
    • https://raguwamirib.weebly.com/uploads/1/3/4/6/134630778/jikibokapel.pdfIn PDF document text
    • https://narigepafosi.weebly.com/uploads/1/3/4/4/134471788/zaluvedar.pdfIn PDF document text
    • https://fupefasupemeze.weebly.com/uploads/1/3/4/3/134315788/kajorulomelelaxuk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8088276-3363-40e0-8248-2794e5b097af/kolumijoguvabamusisevu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcc7735c-398c-43b8-805f-182cfeb5bb77/japisu.pdfIn PDF document text
    • https://s3.amazonaws.com/salade/58110052189.pdfIn PDF document text
    • https://s3.amazonaws.com/kotodur/semetigakujivesofej.pdfIn PDF document text
    • https://s3.amazonaws.com/sepawi/cessna_337_specs_and_performance.pdfIn PDF document text
    • https://s3.amazonaws.com/garorowa/describe_the_sunni_and_the_shia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca9c9901-cc1a-448d-8703-246b85b48b97/can_you_take_a_motorcycle_permit_test_online.pdfIn PDF document text
    • https://s3.amazonaws.com/patotale/81014313584.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_off0000f26d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26D 5712 bytes
SHA-256: b08d7cb15c9d4e671d098f16022fca213d2b4af2291735de9c869dad74db09f8
font_01_sfnt_off000105e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E4 11584 bytes
SHA-256: afe8b523882f8f0e705829e66836dbeb8934b671420eb2a9089edfec5328ddd6