Malicious PDF — malware analysis report

Static analysis result for SHA-256 815a17a41f280aae…

MALICIOUS

PDF

75.3 KB Created: 2021-02-11 00:05:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: d477bf5a0b74b984d5a9c12a893b85a3 SHA-1: b9067d034f64734e48c729cbc315ae88a277fcd7 SHA-256: 815a17a41f280aaea57605bb9cc0120a07f16806a6864c920409e58460fb9826
126 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains keywords related to popular games, suggesting a lure to attract users to these malicious sites.

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://bologen.ru/wb?keyword=attack%20on%20titan%20tactics%20us%20apk PDF link annotation
    • http://devgame.design/fototaledomepopunepuga6sonu.pdfIn PDF document text
    • http://kudretbozaci.com/gloomhaven_class_guide_three_spearsp4vcx.pdfIn PDF document text
    • http://bettyloustintruckbbq.com/creating_alliterative_phrases_worksheet_answer_key58kw1.pdfIn PDF document text
    • http://azalea.store/lippincott_biochemistry_mcqsjv4c0.pdfIn PDF document text
    • http://findattime.com/tofovaromorowokix2ixv.pdfIn PDF document text
    • http://austritkfa.com/thou_crownest_the_year_sheet_musicadeim.pdfIn PDF document text
    • https://cdn.sqhk.co/kugefiruxat/jh6Uica/naruto_x_boruto_ninja_voltage_para_pc.pdfIn PDF document text
    • http://teasmall.space/fhm_magazine_subscription_philippinesgvgrw.pdfIn PDF document text
    • http://eslife.pro/beechcraft_bonanza_f33a_maintenance_manualfmolq.pdfIn PDF document text
    • https://bagawilikazukir.weebly.com/uploads/1/3/1/0/131070307/3936312.pdfIn PDF document text
    • https://bawovaleza.weebly.com/uploads/1/3/2/6/132683088/6933640.pdfIn PDF document text
    • https://cdn.sqhk.co/sadirorig/hjGhiTJ/cheap_pocket_knives_near_me.pdfIn PDF document text
    • https://dusaxufar.weebly.com/uploads/1/3/5/3/135327992/lolebum_fovuzik_lomil_zikesa.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/meludav/apc_smart-_ups_x_1500_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/kijelopazekune/47193411954.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/donopib.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCCE 3784 bytes
SHA-256: a7ac72e5e89f121c0e59c7ac08a445d5448d67afdaffeefc727fbcb452b20eb7
font_01_sfnt_off0000ea5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5B 4852 bytes
SHA-256: 061137a7f6fc3f227e7a6ee3d43f6f500a1d8c389d8b2c68c055e61e0fc2d557
font_02_sfnt_off0000faf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF7 10980 bytes
SHA-256: 352c8dd23a11e4b7dd4a3fb7606237ed4feeaffeb62e823d5d425bb40092300e

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