Malicious PDF — malware analysis report

Static analysis result for SHA-256 62ab18a5d1c29577…

MALICIOUS

PDF

76.5 KB Created: 2021-02-14 04:28:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 651ca49b8adbda772c1944a8f38b4a8b SHA-1: de2bdfa9240eb8241453d04d9fc47f7e9352c0c8 SHA-256: 62ab18a5d1c29577cecd36172a3ba9c175aca774f0701677230c3dfa321c5660
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 disposable domains and link farms, suggesting an attempt to redirect users to malicious content. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, indicating it was likely generated programmatically to serve as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/123?utm_term=blank+letter+from+a+friend+skyrim PDF link annotation
    • https://cdn.sqhk.co/muwitajo/ghjcejj/alter_ego_liz_fgo.pdfIn PDF document text
    • https://cdn.sqhk.co/wazafanez/NAxjchi/transfert_credit_orange_pays.pdfIn PDF document text
    • https://cdn.sqhk.co/fodexuxefeba/jfbia5u/best_multi_coin_crypto_wallet.pdfIn PDF document text
    • http://binixoloxagaj.iblogger.org/37030927129.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457332/normal_600e876b3a257.pdfIn PDF document text
    • http://bowemesuzot.iblogger.org/46618131153.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485440/normal_5feb843350cc7.pdfIn PDF document text
    • https://cdn.sqhk.co/puxedimuwo/gjcScry/broken_heart_free_3d_model.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453532/normal_5fe6bca9b82a8.pdfIn PDF document text
    • https://cdn.sqhk.co/rajemaramiw/ijpPhbW/96382186363.pdfIn PDF document text
    • https://cdn.sqhk.co/riwaxagi/CVJ1jb2/96416776936.pdfIn PDF document text
    • http://perikovu.iblogger.org/mitosis_and_cancer_review_worksheet_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/kekelivig/cpsigqR/60988843745.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502721/normal_5fc87235dedd7.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/sajatofubote/shin_chan_movie_tamil_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/guvovigo/91514435524.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/dozikotakugarufiki.pdfIn PDF document text
    • http://nisijavifusepov.epizy.com/12574331734.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisigetizoxif/forming_a_shed_base.pdfIn PDF document text
    • http://batitesejikak.epizy.com/67962900304.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_off0000ec36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC36 5268 bytes
SHA-256: 1cdf27a1bc0f41b2712a959f834e6305f3b5385ae35f89dabbf8c5bc7db8d3ca
font_01_sfnt_off0000fe17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE17 11816 bytes
SHA-256: 66cf6ab6008b100621701fd3c3c8cab6f7633cac17b3060188efa139e180a081

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