Malicious PDF — malware analysis report

Static analysis result for SHA-256 407374f09634b0da…

MALICIOUS

PDF

74.2 KB Created: 2021-02-04 14:22:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: e6a5c97d01ab7c625165787ee5114605 SHA-1: e956c3515466b5ac66907d21afa25d93d88a75ea SHA-256: 407374f09634b0dacde92aefb8b7660f461d4b1c5572422446da23660096780e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://seumenha.ru/aws?utm_term=slideshow+template+fcpx PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4409250/normal_5fdaac089b034.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468553/normal_601bc286cc55c.pdfIn PDF document text
    • https://wenabavur.weebly.com/uploads/1/3/1/3/131379405/3616401.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491669/normal_5fd7cddf537b6.pdfIn PDF document text
    • https://gawinageriju.weebly.com/uploads/1/3/0/8/130874076/punevefikidi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367268/normal_600135982a9c6.pdfIn PDF document text
    • https://cdn.sqhk.co/govizanorev/gggYgj5/76357020653.pdfIn PDF document text
    • https://cdn.sqhk.co/ropobemuma/2ihHJSl/fepilopafigi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459322/normal_5fcd8a9541b31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492529/normal_5fd17a3ee97c8.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/xefejevife/zubasujekanujegozadof.pdfIn PDF document text
    • http://lumajenav.epizy.com/tableau_cracked_version.pdfIn PDF document text
    • http://rubuvajaroxe.epizy.com/23570644833.pdfIn PDF document text
    • https://s3.amazonaws.com/vukusa/5277632855.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/bootstrap_form_template_w3schools.pdfIn PDF document text
    • http://tojegazanet.rf.gd/81549001957.pdfIn PDF document text
    • https://s3.amazonaws.com/setigafat/99749235394.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_off0000e514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE514 5560 bytes
SHA-256: 2b5697dad08d9ea5542bb0ae5f8aa48272f8d8ca306936167e03f0667755542f
font_01_sfnt_off0000f7f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F4 10492 bytes
SHA-256: e4542c32f6a3606f34b5eaa6612781b0431e050f1127c9adc9838e3b70d53c2c

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