Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f256c2ed66a8bee…

MALICIOUS

PDF

93.2 KB Created: 2021-01-17 11:41:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 45e7b1656bd516cd4b8944579fce7a6c SHA-1: ec8758232b5cdf68c002c9bfaabc7bb0313694eb SHA-256: 3f256c2ed66a8bee6088856ce056ed1f78680c3d227653e1313a0617d4c38321
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many pointing to S3 buckets, suggesting a link farm or SEO spamming operation. One of the external URIs, 'https://trafficel.ru/123?utm_term=cuisinart+ice-70+recipes', appears to be the primary lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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
  • 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://trafficel.ru/123?utm_term=cuisinart+ice-70+recipes PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454575/normal_5fda02f9a54ec.pdfIn PDF document text
    • https://bekonerotukabi.weebly.com/uploads/1/3/4/3/134366377/sexosetaravotero.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459625/normal_5fa5887ccd807.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481665/normal_5fc219471dcec.pdfIn PDF document text
    • https://xasugalepo.weebly.com/uploads/1/3/4/3/134311154/a6aca5a44e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411935/normal_5fa3a2a2a122a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425009/normal_60004d8c7cae5.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/matogapibelifiv/79505235246.pdfIn PDF document text
    • https://s3.amazonaws.com/bifamomove/fubuxumoviwuxepibo.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/conditional_formatting_google_sheets_mobile.pdfIn PDF document text
    • https://s3.amazonaws.com/fonazuzixagizir/kofuriviwaw.pdfIn PDF document text
    • https://s3.amazonaws.com/takateg/wokomugajakulikoko.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/relative_dating_and_absolute_dating_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/remuv/acceder_definicion_informatica.pdfIn PDF document text
    • https://s3.amazonaws.com/tosasugokod/siddharth_gupta_gf.pdfIn PDF document text
    • https://s3.amazonaws.com/lizuseguwix/gizufe.pdfIn PDF document text
    • http://tosowepexinuf.epizy.com/belemepijudefuxukuw.pdfIn PDF document text
    • http://dimarujevetuvif.epizy.com/microsoft_sql_server_2000_licensing_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaduxa/checker_plate_aluminum_sheets.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001266f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1266F 5052 bytes
SHA-256: 4a3fac28f53700303ac52133e1fddeb49616635ac0f21de8aacba450756e5dbb
font_01_sfnt_off000137ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137AD 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off0001403b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1403B 11368 bytes
SHA-256: 25d3f733378bb2479dd7812ec69d6ca45e4aafcbb6d93c7dde6a1e407018d1a8

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