Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4ff4f87a00b3017…

MALICIOUS

PDF

78.6 KB Created: 2021-03-31 08:30:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 7691726cceeb3385185da29071a48048 SHA-1: 06225862d45efa8ba8cea2e1be00f34a1eb17eae SHA-256: f4ff4f87a00b30178f52199eb3edb861807f04be1e4fc70bd8173bf263745905
126 Risk Score

Malware Insights

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

This PDF document is flagged as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, including one that appears to be a phishing lure related to 'ipad app to write on pdf with stylus'. The presence of a link farm on disposable hosting further supports a malicious classification. No scripts were extracted, but the document's structure and embedded URLs suggest it is designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://lozipotod.ru/award?keyword=ipad+app+to+write+on+pdf+with+stylus PDF link annotation
    • https://cdn.sqhk.co/xixujipum/hngghcz/7611338184.pdfIn PDF document text
    • http://it50life.pro/32264569601zdwif.pdfIn PDF document text
    • https://ziwuwozapa.weebly.com/uploads/1/3/4/5/134517717/riniza.pdfIn PDF document text
    • https://kowelisabames.weebly.com/uploads/1/3/1/8/131857626/141874.pdfIn PDF document text
    • http://vinnipoh.fun/segiwosebuvimisogisuxrssfn.pdfIn PDF document text
    • http://telovajov.medianewsonline.com/what_is_expert_review.pdfIn PDF document text
    • https://cdn.sqhk.co/buruvalufe/chejhhh/fables_the_wolf_among_us_comic.pdfIn PDF document text
    • http://shoppingyxplus.xyz/timeline_photoshop_templatepv8vf.pdfIn PDF document text
    • https://soxexovefulobi.weebly.com/uploads/1/3/1/4/131484328/14c26ec6b.pdfIn PDF document text
    • https://wovodolu.weebly.com/uploads/1/3/4/8/134861979/8169aa8c37.pdfIn PDF document text
    • http://matizaw.mywebcommunity.org/blockchain_for_dummies_tiana_laurence_download.pdfIn PDF document text
    • http://coupons2020.info/65259827601gdwwo.pdfIn PDF document text
    • https://zumikifekov.weebly.com/uploads/1/3/0/8/130813997/c8dea610f6bc.pdfIn PDF document text
    • https://cdn.sqhk.co/gasajolop/icjd5jj/61954245704.pdfIn PDF document text
    • https://cdn.sqhk.co/julukijowi/hcgcibO/dragon_quest_vi_walkthrough_snes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://golokelu.rf.gd/cuneiform_bone_fracture.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd316df8-46b9-4231-a400-6f5555472404/what_books_are_in_bob_books_set_1.pdfIn PDF document text
    • http://luxizetugo.epizy.com/lazok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e33f1628-4f41-42c6-8e65-07ed9a8a7494/21993829315.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8fa9e52-905b-47c1-b83c-5bb54c208ec3/nanostation_loco_m2_setup_bridge.pdfIn PDF document text
    • http://zitasixan.atwebpages.com/sedifujovotexu.pdfIn PDF document text
    • http://tizivedimusos.epizy.com/49747849656.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a515348e-2f00-457d-bd05-0162089253a0/69606395367.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_off0000f637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF637 5260 bytes
SHA-256: 05436e366b9e0cd1c3cad79acc0160a61d7d33434f75fd740352930cce35c281
font_01_sfnt_off0001082a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082A 10756 bytes
SHA-256: c6aaab6a5550f5d86ac30817ecb292e496a2c645b4bf627452e43e4e088f13bb

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