Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d258706270f9300…

MALICIOUS

PDF

58.0 KB Created: 2020-12-22 14:53:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: db7609b2886d35d511e84662099c2d44 SHA-1: a9972de22d222562336030ca0bb3d10cfeb858d1 SHA-256: 1d258706270f9300b302dd58a853236a75f270f7b3b5c3368d3da3339b7e227b
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' suggesting a malicious intent to direct users to external sites. The ML classifier and ClamAV detection strongly indicate malicious content. The primary malicious URL identified is trafftec.ru, which is likely used to host a phishing page or a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://trafftec.ru/aws?utm_term=gateway+workbook+answers+b1 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4390074/normal_5f9fc0361c0b1.pdfIn PDF document text
    • https://jikuvagipotax.weebly.com/uploads/1/3/4/6/134647272/b6ead06b83.pdfIn PDF document text
    • https://movamapipimopi.weebly.com/uploads/1/3/5/3/135303402/fomegijavifatuxo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414495/normal_5f9fdee0da1de.pdfIn PDF document text
    • https://jikanozirupeson.weebly.com/uploads/1/3/4/6/134656521/1675339.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/c76dab1c-47c8-40b9-a2e9-fc55a7b72b2e/1999_ap_chemistry_free_response_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/28515517504.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/sam_cooke_bring_it_on_home_to_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/937075c2-f117-4ca6-b1df-8967c8cc8702/92384972378.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/68748017872.pdfIn PDF document text
    • https://s3.amazonaws.com/mujevubutukoxu/jakisajoxanukirifa.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/buzobofavurefev.pdfIn PDF document text
    • https://s3.amazonaws.com/zonebon/69450606915.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_off0000a8f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA8F3 5128 bytes
SHA-256: b72ad004c2481a601f27068d5932569dd3c4b0c50b95da902a97bffac3a0215b
font_01_sfnt_off0000ba96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA96 9696 bytes
SHA-256: 73746b644ac87a5eaf7b1d7f291cb503b435a28e299128e3b34ae2465e2789bd

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