Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4396246ed4181ad…

MALICIOUS

PDF

74.2 KB Created: 2021-03-17 10:02:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: a97cab06816824aa41f5909bfe5757d6 SHA-1: 7e7d3f9a602b8d2b108608175e374fc47498856d SHA-256: e4396246ed4181ad339c2ad4a36122adc04f6915a7a848de552ca5fc78399c1f
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, appears to be a lure related to 'brainpop basic probability worksheet answers', aiming to trick users into clicking the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://botokaw.ru/strik?utm_term=brainpop+basic+probability+worksheet+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465687/normal_601e3efabcb3f.pdfIn PDF document text
    • https://nabivedoki.weebly.com/uploads/1/3/1/4/131407492/689543.pdfIn PDF document text
    • https://govoxarenaja.weebly.com/uploads/1/3/4/8/134874143/8835384.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467019/normal_5fe802ee9d9e0.pdfIn PDF document text
    • https://cdn.sqhk.co/fikalibumi/JgiChgh/all_hotmail_emails_to_computer.pdfIn PDF document text
    • https://tisalupiruj.weebly.com/uploads/1/3/4/0/134018152/562891fe91aea.pdfIn PDF document text
    • https://cdn.sqhk.co/xezafube/jdZFgjv/26567432263.pdfIn PDF document text
    • https://cdn.sqhk.co/kefexunas/D7iahYD/rowulumivutitumevirub.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479237/normal_5ffdd517430e9.pdfIn PDF document text
    • https://cdn.sqhk.co/pirujezexod/kwajhmf/lego_duplo_marble_run_instructions.pdfIn PDF document text
    • https://gejidodedawo.weebly.com/uploads/1/3/4/0/134018108/1002020.pdfIn PDF document text
    • https://mafoguwof.weebly.com/uploads/1/3/1/4/131438304/e964a902.pdfIn PDF document text
    • https://cdn.sqhk.co/sawibevas/ha6SOih/30221524579.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492901/normal_5fc9336899326.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469827/normal_5ff6680da74ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375698/normal_603fe8199308e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382209/normal_5fe961e92f1d4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://45dcde1a-aed5-4138-b95e-a0f768a283bf.filesusr.com/ugd/89441e_e03fed5cabac410b99f6b67496351f6d.pdf?index=trueIn PDF document text
    • https://c3a7a64c-5591-430b-94d7-c2eadfdf3523.filesusr.com/ugd/966478_15c6c0cb7480411087f74e6da6be2513.pdf?index=trueIn 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_off0000e375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE375 5468 bytes
SHA-256: 49af6aca206c5de963efea176b9034f4e504c20ed89ad9367764163cf86b18fc
font_01_sfnt_off0000f61d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61D 11048 bytes
SHA-256: 81e7e3db512bdbc7e86304af903fd685aa0818c669bda57a5c180d571b3ab1be

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