Malicious PDF — malware analysis report

Static analysis result for SHA-256 f16fbe39cbc3299a…

MALICIOUS

PDF

72.8 KB Created: 2021-01-23 00:55:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: c985d254286ed5ac23a936b01a7c7458 SHA-1: 35e1e7793f0b2678373c2c8f4b914e8fa4e41f9c SHA-256: f16fbe39cbc3299a8b18bdf035f1223188081728ee1a2f82466e183fae956f74
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, many pointing to disposable domains, and one prominent URL related to 'driving school mod apk', suggesting a lure for potentially unwanted or malicious software downloads. The presence of external URIs and the link farm heuristic indicate a strong intent to redirect users to external resources.

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/aws?utm_term=driving+school+2016+mod+apk+techylist PDF link annotation
    • https://site-1204796.mozfiles.com/files/1204796/13829477741.pdfIn PDF document text
    • https://cdn.sqhk.co/bofogarabu/oghvhfZ/84187455884.pdfIn PDF document text
    • https://site-1246416.mozfiles.com/files/1246416/puwefenobavud.pdfIn PDF document text
    • https://cdn.sqhk.co/dubikewe/0nge4ho/junivasofugovawonagif.pdfIn PDF document text
    • https://cdn.sqhk.co/lituxopevuk/pigVG8N/xitefiviwalirateko.pdfIn PDF document text
    • https://site-1215037.mozfiles.com/files/1215037/25425649457.pdfIn PDF document text
    • https://cdn.sqhk.co/xevuvuxene/iRdogce/39474922210.pdfIn PDF document text
    • https://cdn.sqhk.co/tinipuded/h8yieii/sabituv.pdfIn PDF document text
    • https://site-1178703.mozfiles.com/files/1178703/50269961064.pdfIn PDF document text
    • https://site-1174439.mozfiles.com/files/1174439/18278859109.pdfIn PDF document text
    • https://cdn.sqhk.co/vemonososepa/jcidheh/fall_guys_game_engine.pdfIn PDF document text
    • https://cdn.sqhk.co/mivijigonof/fbgcEij/horizon_fitness_treadmill_repair.pdfIn PDF document text
    • https://cdn.sqhk.co/remimidotomi/bCLOhfq/go_karts_near_me_orlando.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://takugiwem.rf.gd/89769657292.pdfIn PDF document text
    • http://bevonox.epizy.com/surya_the_brave_soldier_movie_filmywap.pdfIn PDF document text
    • http://tikarere.epizy.com/frictional_force_experiment_lab_report.pdfIn PDF document text
    • http://wijogural.epizy.com/dovugajinuregavireraxe.pdfIn PDF document text
    • http://nogobixa.epizy.com/mahogany_tree_farming_project_report.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_off0000dc28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC28 6192 bytes
SHA-256: a552f6ca22b2c89d49c41a31acf4655319161698016eed750496f68ec201b9e8
font_01_sfnt_off0000f12b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12B 10712 bytes
SHA-256: dcac44ead65679533a4a698019143774c7dbdd7cf8c357aa1d82fe44d706949c

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