Malicious PDF — malware analysis report

Static analysis result for SHA-256 275750ecca039de8…

MALICIOUS

PDF

73.9 KB Created: 2021-01-17 14:01:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 769be248bbbaeaecbf8e8c44b2d4e185 SHA-1: 94aa51481ea9ff64d75a22252ab1df9676238500 SHA-256: 275750ecca039de85456c1d0955b2500524eb3506755d5139e33975fe6c2aafb
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffe.ru/aws?utm_term=bizagi++free+em+portugues PDF link annotation
    • https://feleluxotikuko.weebly.com/uploads/1/3/4/3/134338959/d97d768a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366408/normal_5fa4f72135e49.pdfIn PDF document text
    • https://site-1174433.mozfiles.com/files/1174433/sprite_ninja_ninja_hattori_kannada.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460076/normal_5fe747ff56dba.pdfIn PDF document text
    • https://molobaguzali.weebly.com/uploads/1/3/0/7/130739923/xagaji_taripaluvuvijo_vuluwit.pdfIn PDF document text
    • https://xirofagoxo.weebly.com/uploads/1/3/4/5/134576207/lerugomekaxe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367951/normal_5fd646e9ac455.pdfIn PDF document text
    • https://refapezi.weebly.com/uploads/1/3/4/9/134904673/butumosalaba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451566/normal_5fb5dc6254fbb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379733/normal_5fd9e12dd2fe2.pdfIn PDF document text
    • https://pubodepilup.weebly.com/uploads/1/3/1/4/131406337/14b0ffc89a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386092/normal_5f92c451337ba.pdfIn PDF document text
    • https://mesipaku.weebly.com/uploads/1/3/1/3/131383407/2327078.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418566/normal_5fd170e0e756e.pdfIn PDF document text
    • https://gipurafesab.weebly.com/uploads/1/3/1/6/131637457/juzatupasus.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473640/normal_5ff215fdd5ed7.pdfIn PDF document text
    • https://site-1179316.mozfiles.com/files/1179316/warlings_armageddon_jugar_online.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378161/normal_5feb4f01384f5.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/fatisake/baby_crib_sheet_protector.pdfIn PDF document text
    • https://s3.amazonaws.com/gavapozalilup/cumulative_update_for_windows_server_2016.pdfIn PDF document text
    • https://s3.amazonaws.com/bisute/pisepoterajevog.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_off0000e37c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37C 5288 bytes
SHA-256: 087ff75d98db0e0fe0e2ae870c6647121b62e18de9349733525ef1ea78ac8c78
font_01_sfnt_off0000f574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF574 11028 bytes
SHA-256: b1bb55f0f06b9587df519b1cd5d35e7fbd1e45bfd410688cbe18e2b4da74b32b