Malicious PDF — malware analysis report

Static analysis result for SHA-256 14b3fc637cbee3bc…

MALICIOUS

PDF

73.5 KB Created: 2021-02-06 08:22:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 6aafae3234918798a922e9327c946288 SHA-1: 1477395a02ea568411e4d547c1c86b2a3e44296b SHA-256: 14b3fc637cbee3bcb9965c670440a816a331958e098717e253168774dd5d1e54
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, indicative of a link farm designed to distribute malicious content or phish users. The presence of external URIs and the overall structure strongly suggest a spearphishing attachment used to redirect victims to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crophysi.ru/123?utm_term=super+arcade+racing+apk PDF link annotation
    • https://cdn.sqhk.co/videgogaf/dgfmNij/totiporozefalasiz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484834/normal_5fd1ef0802dc0.pdfIn PDF document text
    • http://studyweb.site/pofemimur5j90w.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495973/normal_601d06c7a4334.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408993/normal_60102501408fc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446925/normal_60029887d70d4.pdfIn PDF document text
    • http://hookup153.space/7617499303msl4q.pdfIn PDF document text
    • https://xafijedalab.weebly.com/uploads/1/3/0/7/130775792/6373950.pdfIn PDF document text
    • https://gepidoduxaw.weebly.com/uploads/1/3/5/3/135324144/3178757.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379732/normal_6011f74212f8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493920/normal_601dbb292a0d7.pdfIn PDF document text
    • http://copyright-notice-ig.com/42810053978dhxis.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462066/normal_5fdf165029b81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379234/normal_6009f5f69d154.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390373/normal_5ffd66687805f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://pumumiz.epizy.com/momentum_conservation_worksheet_answers.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_off0000d447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD447 4892 bytes
SHA-256: 1cc23761bb75b09268c43cfd14f016a3d41d17228cf3ee3f4aa7ef1836f0c142
font_01_sfnt_off0000e4e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E8 10616 bytes
SHA-256: 306b9a513c01dc97dd6fe4bdad0b68206bd27d87b6441f3dcb430a4041cdcaae
font_02_sfnt_off0001093f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093F 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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