Malicious PDF — malware analysis report

Static analysis result for SHA-256 35b4b7e3bccc4aca…

MALICIOUS

PDF

115.9 KB Created: 2021-02-10 18:52:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: e8e2340419fe3205e19004e00f1ae71a SHA-1: 3d32bbe0e9b3e65ea663cd50130784fe93c466f9 SHA-256: 35b4b7e3bccc4acab4aee4f3a6651d2c47dbcf868cbdd33f75a23d8d0e9185f5
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting services, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a large number of links on potentially untrusted domains, likely to deceive users or search engines.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://jottigo.ru/aws?utm_term=geometria+descriptiva+arquitectura+pdf PDF link annotation
    • https://xopugexufejan.weebly.com/uploads/1/3/4/7/134709921/zupoborubidod-tefat-sabofuzedisop.pdfIn PDF document text
    • https://volufijipezuji.weebly.com/uploads/1/3/4/7/134703795/rarulinafa.pdfIn PDF document text
    • http://nakrutkavk.site/2618245007b0dwx.pdfIn PDF document text
    • http://help-bluebadgecustomer.com/xamozelusubuduwoso2vu5k.pdfIn PDF document text
    • http://bigowet.xyz/telecharger_mobogenie_apk_2018ljqir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380228/normal_600bb5c81faba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479470/normal_60206f3f19ed5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450351/normal_601bba2b1d053.pdfIn PDF document text
    • http://befelofote.iblogger.org/aspera_jazz_user_manual.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bibirosomuxir.epizy.com/disisun.pdfIn PDF document text
    • https://s3.amazonaws.com/liwara/41526329234.pdfIn PDF document text
    • http://nupifikitove.epizy.com/gepevupavoli.pdfIn PDF document text
    • http://zusunikumejimet.rf.gd/4196759959.pdfIn PDF document text
    • https://s3.amazonaws.com/zedilegol/arbitrary_waveform_generator_usb.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_off0001888b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1888B 5488 bytes
SHA-256: 5b8ffd069af727f798bf12a966a21d2092b61c3f09ae89155a528ce8d2d6dec0
font_01_sfnt_off00019b25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19B25 11420 bytes
SHA-256: eb4d27138c455af116622e86c587aa7650cddcd006fcb5ce53d8731a870a1de1

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