Malicious PDF — malware analysis report

Static analysis result for SHA-256 01a2fa959873220e…

MALICIOUS

PDF

69.2 KB Created: 2021-02-10 14:42:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e3414e9105f178311511d1114bb7da48 SHA-1: 1525b74d7235357ee1ca18cd813821a9cb9a89de SHA-256: 01a2fa959873220e340c0ea2fbb35fbf77f24392cca22128297d37db51235ecc
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to external sites, many of which are hosted on disposable domains or use UTM parameters, indicative of a link farm or phishing campaign. The document body, though heavily obfuscated, suggests a lure related to a 'Mahopac weather report'. No scripts were extracted, but the presence of multiple external links strongly suggests the intent is to redirect users to malicious websites for further exploitation.

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://druttle.ru/aws?utm_term=mahopac+weather+report PDF link annotation
    • https://cdn.sqhk.co/pobojatizopa/hiiejfr/78093945186.pdfIn PDF document text
    • http://rajedat.iblogger.org/immigration_bureau_thailand_90_days_report_online.pdfIn PDF document text
    • https://cdn.sqhk.co/ketusugedi/LvjhggB/memixagudedosiligok.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369630/normal_5fe0198a4749a.pdfIn PDF document text
    • http://dreamingdeveloper.com/806384389489k0lt.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501193/normal_5ff6297a15110.pdfIn PDF document text
    • https://cdn.sqhk.co/wevodapobu/jjar8jg/20567063211.pdfIn PDF document text
    • http://baugroup.info/happier_ed_sheeran_ukulele_play_alongl6o4h.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456116/normal_60075a24ab4d6.pdfIn PDF document text
    • http://svoytrylend.xyz/vegetable_dicer_cube_cuttingvxft7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410975/normal_601404774214e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405181/normal_5fd9e820cdcf3.pdfIn PDF document text
    • https://cdn.sqhk.co/desogepupema/jpgiie4/bupezurula.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454049/normal_5fe728be1f832.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kedenutorufet.rf.gd/apple_developer_coding_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/gurowozenupifi/39844333787.pdfIn PDF document text
    • https://s3.amazonaws.com/vavejijitatofu/federal_employees_benevolent_fund_marriage_form.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_off0000d309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD309 4908 bytes
SHA-256: 9b6a34d4b5ee419d09142fd3d2aa634ede9fdb0f58643a550e5a4f783f620f6c
font_01_sfnt_off0000e3d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D5 10644 bytes
SHA-256: 26aebc124bbc156c9edc72ccd4999b68f52f0d88949244267dad3bfc1310f6fd

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