Malicious PDF — malware analysis report

Static analysis result for SHA-256 52b9a978c80e274d…

MALICIOUS

PDF

66.8 KB Created: 2021-03-02 07:38:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c442767833de4e7b022c3ff22d59e6ed SHA-1: fa6894820f5c820d5a7cf7c5308dea9ad269ee59 SHA-256: 52b9a978c80e274d7fcb18eb7889269a3bbe839a2985b5d351bb91cfe2d7c0d7
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs and is flagged by ClamAV as a phishing trojan. The ML classifier also strongly indicates maliciousness. The document body, though heavily obfuscated, suggests a lure related to a 'Report to the principal's office quiz', which is likely a pretext to drive users to one of the numerous external URLs for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/wix?keyword=report+to+the+principal%2527s+office+quiz PDF link annotation
    • https://cdn.sqhk.co/voxedijudibo/mRhihbd/23032580107.pdfIn PDF document text
    • https://cdn.sqhk.co/lipetebo/RgdRhat/77326157333.pdfIn PDF document text
    • http://neojust.ru/53251493303x58x1.pdfIn PDF document text
    • https://cdn.sqhk.co/nikajovefer/ijfhbmj/gaxikagapiwagadifubani.pdfIn PDF document text
    • http://twenty-promo2020.ru/29112279096i8wq2.pdfIn PDF document text
    • https://cdn.sqhk.co/mekaxosur/ahe430e/libiretuv.pdfIn PDF document text
    • https://cdn.sqhk.co/jerivudofin/d088rhc/sakopanidunibugo.pdfIn PDF document text
    • http://ch-bewertung-2888.xyz/nfl_head_coach_pc_download_full_free5nxt4.pdfIn PDF document text
    • http://f13x.xyz/snapping_turtle_bite_woundowauf.pdfIn PDF document text
    • http://nonly.xyz/824412044505v7dm.pdfIn PDF document text
    • http://goldstein.berlin/78350084197bhtbo.pdfIn PDF document text
    • http://alkim.xyz/winnie_the_pooh_personality_test9sseh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488116/normal_601e8ca6d3099.pdfIn PDF document text
    • https://cdn.sqhk.co/jebavimot/cjg8jdI/lazux.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD4C 5204 bytes
SHA-256: d3bcad002cd7199b37e1655d6d9eb5913cb9018d2c2bcdc80055b8e1167aee8c
font_01_sfnt_off0000cf08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF08 9644 bytes
SHA-256: da7c47c1ee178230aad071597e70ade7fd0498030d673ad00a9532deda08a544
font_02_sfnt_off0000f036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF036 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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