Malicious PDF — malware analysis report

Static analysis result for SHA-256 b850a4fc148762be…

MALICIOUS

PDF

83.2 KB Created: 2021-02-21 03:44:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: f9eb50da347a72286acfc99cbdf5d749 SHA-1: 952f572964e2f1d628b1e475a08b29ad0817bd86 SHA-256: b850a4fc148762beb4582c8cc1d82a6ef78fa82422e3c2bef8635759da53b062
186 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The document body, though heavily obfuscated, appears to be a lure related to DMV warrant checks, aiming to trick users into clicking through to these external sites.

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://druttle.ru/wix?keyword=does+the+california+dmv+check+for+warrants PDF link annotation
    • https://cdn.sqhk.co/zufuxirap/jcifsif/tubi_free_movies_and_tv_shows_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369631/normal_5fc5c653d9596.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445564/normal_60210aa4bbf36.pdfIn PDF document text
    • https://cdn.sqhk.co/demapibo/bV6ECgf/jenat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424982/normal_601c8706017d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370273/normal_60318cdbe10b3.pdfIn PDF document text
    • https://lumirofelefepo.weebly.com/uploads/1/3/4/8/134892557/f324e.pdfIn PDF document text
    • https://lebivituwaw.weebly.com/uploads/1/3/1/8/131856954/3853475.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374366/normal_600c55242c46b.pdfIn PDF document text
    • https://cdn.sqhk.co/leruwexikud/hghigd3/car_racing_club_names.pdfIn PDF document text
    • https://vigobekopu.weebly.com/uploads/1/3/2/3/132302998/gawuzu.pdfIn PDF document text
    • https://cdn.sqhk.co/setewefasari/YmI3CO3/17533707462.pdfIn PDF document text
    • https://jabesukugadipo.weebly.com/uploads/1/3/2/8/132814964/bolakad-xinuxaferori-piwasazufagoxu.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/sitozi/australia_landline_phone_number_format.pdfIn PDF document text
    • https://s3.amazonaws.com/rokuwapesu/531_boring_but_big_spreadsheet.pdfIn PDF document text
    • https://s3.amazonaws.com/jifesu/alveston_cygnets_ofsted_report.pdfIn PDF document text
    • https://s3.amazonaws.com/kosamupim/mefolapekujejosix.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_off0001083a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083A 5476 bytes
SHA-256: 04b607e95c1b747ca32a74cebb4b7318bf1fac9fce9a01dd31fc1fe377f4b1cf
font_01_sfnt_off00011acc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ACC 10712 bytes
SHA-256: 709fa446a7eedef4ac5e98a6594e06593b6745a6c02bd9b78f27c46c74a700c3

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