Malicious PDF — malware analysis report

Static analysis result for SHA-256 23263b05081f53b0…

MALICIOUS

PDF

83.6 KB Created: 2021-05-14 10:52:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 442bec259748efc947c5a94071dead9c SHA-1: ed637d9fc913162706a6d64053f28da1c728b963 SHA-256: 23263b05081f53b09d60b89398dfdefd0d0b4ff6902c8f73b9d7c5a8902cbf46
194 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. The document's content, presented as a worksheet answer key, is a lure to encourage users to click these links. The presence of ClamAV detection and ML flagging indicates a high likelihood of malicious intent, possibly to download further payloads or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://kuzutuzo.ru/strik?utm_term=amoeba+sisters+video+recap+enzymes+worksheet+answer+key
    • https://vinosubolab.weebly.com/uploads/1/3/5/3/135316207/8961426.pdf
    • https://fepapidatimupiv.weebly.com/uploads/1/3/1/4/131437812/8224386.pdf
    • https://static.s123-cdn-static.com/uploads/4470975/normal_5fdf13b9156f9.pdf
    • https://melonugijiroduk.weebly.com/uploads/1/3/5/3/135325977/fujaf.pdf
    • https://wawotuxela.weebly.com/uploads/1/3/4/3/134352856/1632326.pdf
    • https://rojanebe.weebly.com/uploads/1/3/1/6/131637229/lufuxusid-bupuw-fugetiki.pdf
    • https://cdn.sqhk.co/votiwixuduzo/iaVxjhK/verizon_mdm_youtube.pdf
    • https://zulovinivu.weebly.com/uploads/1/3/4/7/134758195/zolefun.pdf
    • https://zubisixoligifi.weebly.com/uploads/1/3/4/4/134479514/3445993.pdf
    • https://static.s123-cdn-static.com/uploads/4423431/normal_6004ea5c893ca.pdf
    • https://cdn-cms.f-static.net/uploads/4489599/normal_603df887526c2.pdf
    • https://cdn-cms.f-static.net/uploads/4404755/normal_5fdb1418a5c94.pdf
    • https://lurofigugibax.weebly.com/uploads/1/3/4/6/134686006/262584.pdf
    • https://vusokozederik.weebly.com/uploads/1/3/4/9/134901716/potarekewugagumu.pdf
    • https://cdn.sqhk.co/vuveleni/d2xjehj/19016933216.pdf
    • https://kubinivoboduwu.weebly.com/uploads/1/3/4/6/134601548/3608790.pdf
    • https://ledijonag.weebly.com/uploads/1/3/4/6/134689342/bumizuvonikap.pdf
    • https://cdn-cms.f-static.net/uploads/4481820/normal_6057f08e3e8f0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pirosisob/53531375291.pdf
    • https://s3.amazonaws.com/nuselufuzo/91602878288.pdf
    • https://s3.amazonaws.com/tuxalowafokuvo/how_to_become_a_soccer_goalie.pdf
    • https://s3.amazonaws.com/jazamerijekufol/motorola_xts_1500_impres_battery.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001063c.bin
54c18918c773ebf0e950684ecf01c9956c7e12eaa7a534608edb8705ebb5c04a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1063C 5780 bytes
font_01_sfnt_off000119d8.bin
2680252a2ecde46d8b85350f2a577ac77819d0f54c21bfa8be02826871b03a96		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119D8 11224 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.