Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b37ddc63627cd03…

MALICIOUS

PDF

73.4 KB Created: 2020-11-19 14:57:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 4e39948ec8707d16c5f6ed78e8cfaa9a SHA-1: 3158f950b986d3dd8d8e6ddd93917df673441bbf SHA-256: 3b37ddc63627cd034df11ce3af1119d3e6a4238088a801f0530b4175f7410ce1
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting services, and one prominent URL that appears to be a redirector. The document body, though heavily obfuscated, suggests a lure related to 'exercises', which is consistent with phishing or scam pretexts. No scripts were extracted, but the presence of multiple external links indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffe.ru/strik?utm_term=hibridacion+sp+sp2+sp3+ejercicios+resueltos PDF link annotation
    • https://saxibodusazo.weebly.com/uploads/1/3/0/7/130740440/d31be93c5b9c22.pdfIn PDF document text
    • https://dejixujulazefe.weebly.com/uploads/1/3/4/8/134867847/tigubusowizak_kezoru.pdfIn PDF document text
    • https://fobopogukigu.weebly.com/uploads/1/3/4/3/134366855/9bd25e.pdfIn PDF document text
    • https://rozapalevode.weebly.com/uploads/1/3/4/7/134705228/7164504.pdfIn PDF document text
    • https://vabepazepa.weebly.com/uploads/1/3/4/5/134596671/5016921.pdfIn PDF document text
    • https://gozofuma.weebly.com/uploads/1/3/0/8/130874065/pigisilokugigu.pdfIn PDF document text
    • https://jewelalebun.weebly.com/uploads/1/3/4/5/134585336/nifebipu_fikanokededoz.pdfIn PDF document text
    • https://reredutubonuki.weebly.com/uploads/1/3/0/7/130775370/zanixuserefesafoz.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/loneminovu/datexineri.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/konuwetudabevipatiwituj.pdfIn PDF document text
    • https://s3.amazonaws.com/tirimofufemukat/bsc_agriculture_online_admission_form_in_maharashtra.pdfIn PDF document text
    • https://s3.amazonaws.com/jovekus/63321621703.pdfIn PDF document text
    • https://s3.amazonaws.com/megelugik/57967028642.pdfIn PDF document text
    • https://s3.amazonaws.com/purawuma/18597476102.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1e4cb44-832c-4ee4-82c2-f3048560a9ed/saroz.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_off0000dfea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEA 5540 bytes
SHA-256: abfeb78c3548ec8dcb51b6bb9053c9c4d4ff091db6f125e3862d765569fbd613
font_01_sfnt_off0000f2c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C7 11252 bytes
SHA-256: cabac701ab44f0bd44a3cf878e07ccfcd5b2abfa04128e81de09181348d49f7b

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