Malicious PDF — malware analysis report

Static analysis result for SHA-256 b64d49ad4148f73e…

MALICIOUS

PDF

74.9 KB Created: 2021-03-11 21:42:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 8d115a8d7968bd30a81b3cb04693e8f4 SHA-1: f5625be5a11b47ea9f77f4cd487b7385b1e9d26a SHA-256: b64d49ad4148f73e9b7133c8eeeff351c26643cc749aa7636f201863080c48b2
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic to redirect users to malicious content. The embedded URLs are the primary indicators of compromise, likely leading to further stages of attack or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://dugedepap.ru/award?keyword=toyota+auris+2020+manual+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383464/normal_603eba46d30a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367271/normal_60303d3597918.pdfIn PDF document text
    • https://cdn.sqhk.co/novozefox/jxtGgiG/roadrunner_desert_facts.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494875/normal_6002753c4d78f.pdfIn PDF document text
    • https://guxitubekin.weebly.com/uploads/1/3/4/2/134267073/5871081.pdfIn PDF document text
    • https://sakobapo.weebly.com/uploads/1/3/3/9/133999770/9ddb027.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417834/normal_60215835c8c30.pdfIn PDF document text
    • https://cdn.sqhk.co/nasubivapu/hjid7ja/78200878961.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371266/normal_6012bf71f3bc8.pdfIn PDF document text
    • http://kapovulup.mywebcommunity.org/41416543294.pdfIn PDF document text
    • https://fenawivo.weebly.com/uploads/1/3/4/0/134000055/zusexinet.pdfIn PDF document text
    • http://rupaduwovuw.getenjoyment.net/where_can_i_donate_furniture_in_seattle.pdfIn PDF document text
    • https://xisiwazebisa.weebly.com/uploads/1/3/4/7/134758569/9913061.pdfIn PDF document text
    • http://rufujatev.iblogger.org/rudram_chamakam_malayalam.pdfIn PDF document text
    • http://papogemedafudak.22web.org/naneseb.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/256e9350-ea0a-471a-82ff-e18f5c4124b6/34188996505.pdfIn PDF document text
    • http://dogabofeki.epizy.com/esperanza_renace_las_almendras_resumen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7763b642-eea3-4eaf-9e77-a8101af8af59/what_does_it_mean_when_service_airbag_light_comes_on.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED45 5512 bytes
SHA-256: cb176bd60b3b087690b053394d0cffcfde50d2419877101db6ee021f5bae553b
font_01_sfnt_off0000fff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF2 10564 bytes
SHA-256: 41c7faa016aa4d3937f9550df14bf5fa76e85b045de38783c014446c086d5f51

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