Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aacfb9fd3f5a219…

MALICIOUS

PDF

66.3 KB Created: 2020-11-18 13:43:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 9f78012d709d8f9854053412cf4f65f2 SHA-1: a7497ef64edd141e9bdee6820a02eb02aeeb5b5a SHA-256: 1aacfb9fd3f5a219e4060ab421997af703235ff5b104bc4674d347e060f6213a
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a PDF link farm and another for a redirector link pointing to 'traffmen.ru'. This suggests the document's primary purpose is to direct users to potentially malicious or deceptive websites. While no scripts were extracted, the PDF structure and link farm indicate a phishing or SEO manipulation attack. The ClamAV detection further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/wb?keyword=2014%20calc%20bc%20frq%20answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4483104/normal_5fb4af88ef65e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374703/normal_5f8ddfcdcfd0a.pdfIn PDF document text
    • https://bogadisosupotaj.weebly.com/uploads/1/3/0/7/130776541/sumariganododam-tarubip-kukut-zitedu.pdfIn PDF document text
    • https://bepopasexib.weebly.com/uploads/1/3/4/3/134356469/lexizoza-guloxizug-nivaxiraf-jefejafib.pdfIn PDF document text
    • https://siregudak.weebly.com/uploads/1/3/0/7/130738759/9298fbba.pdfIn PDF document text
    • https://kenometiwu.weebly.com/uploads/1/3/4/3/134340836/6a31d09e15ee5e.pdfIn PDF document text
    • https://fuvunubeliratak.weebly.com/uploads/1/3/4/6/134610803/relanubemexatej.pdfIn PDF document text
    • https://pevugubak.weebly.com/uploads/1/3/2/7/132740457/3c8c50b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377909/normal_5f9bed63bb4c9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fomaralunex/mah_e_meer_full_movie_online.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/cancionero_de_rock_nacional_argentino_para_guitarra.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/86811210057.pdfIn PDF document text
    • https://s3.amazonaws.com/buponuwebi/24627234104.pdfIn PDF document text
    • https://s3.amazonaws.com/lebaxa/65913470598.pdfIn PDF document text
    • https://s3.amazonaws.com/retobifulipo/83103265576.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_off0000c690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC690 5552 bytes
SHA-256: 31629c18e7db06243512ef3f6f792236a89a97c7ed887a16899cff7a51763d77
font_01_sfnt_off0000d997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD997 10376 bytes
SHA-256: c94be7125a556d2663a1082cea101d4c7486a604b19628c96de51e9f9ffe10b4

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