Malicious PDF — malware analysis report

Static analysis result for SHA-256 53d5238e7dbba4f7…

MALICIOUS

PDF

75.1 KB Created: 2021-01-19 14:03:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: fead20e803a2785d656982e6dbc0b02a SHA-1: a5224ecfc79ab5d449d3fdd44c628b1c54b0be5d SHA-256: 53d5238e7dbba4f70f943d31ad59266867a4268884a84cebdb3f665757615109
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document was flagged by multiple heuristics as a link farm, containing numerous external URLs pointing to potentially malicious content. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The presence of a large number of external links suggests an attempt to lure users to external sites, likely for credential harvesting or further malware delivery.

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://trafffe.ru/123?utm_term=cbcl+scoring+manual PDF link annotation
    • https://cdn.sqhk.co/noperizapewo/zVTgjij/final_fantasy_16_not_coming_to_pc.pdfIn PDF document text
    • https://gitexapovaje.weebly.com/uploads/1/3/4/4/134464395/wuzupew.pdfIn PDF document text
    • https://cdn.sqhk.co/xekemini/idihrih/famubomesoso.pdfIn PDF document text
    • https://gukaguse.weebly.com/uploads/1/3/1/3/131398473/jotopubuvuv.pdfIn PDF document text
    • https://woxigixekamut.weebly.com/uploads/1/3/0/7/130739530/jikema-vozim-pexegisal-mumuri.pdfIn PDF document text
    • https://cdn.sqhk.co/kajurineg/bhbhiYw/jukotuteritefosetelod.pdfIn PDF document text
    • https://cdn.sqhk.co/zokasejiz/dhiCgfx/87010351870.pdfIn PDF document text
    • https://lujipened.weebly.com/uploads/1/3/2/7/132740552/89d49be2146c4d.pdfIn PDF document text
    • https://cdn.sqhk.co/piwixesiwufo/ggidIi5/introduction_to_entrepreneurship_skills.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376866/normal_5fc488b69ecc6.pdfIn PDF document text
    • https://xoludifatak.weebly.com/uploads/1/3/4/4/134477652/5c8753.pdfIn PDF document text
    • https://ketawisu.weebly.com/uploads/1/3/1/4/131454029/5940815.pdfIn PDF document text
    • https://cdn.sqhk.co/gogojelawov/hhgGgim/84555840144.pdfIn PDF document text
    • https://tukumexof.weebly.com/uploads/1/3/4/7/134721389/muzafipibuladu-subiz-xideloreg-vidod.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://nupopejif.epizy.com/zizavapoxutisotuw.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_off0000dba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA9 4964 bytes
SHA-256: a06c21b61cf3a0256d60b5bb863b49ce8664b7c4d8cba8bf1bd02305b56f74b1
font_01_sfnt_off0000ec57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC57 11076 bytes
SHA-256: 2df9903cbcc2f9da666d89a3783966c0572c975bb9c9a42dbb042d899284904a
font_02_sfnt_off000111ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111CE 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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