Malicious PDF — malware analysis report

Static analysis result for SHA-256 49a04eeec241da41…

MALICIOUS

PDF

77.1 KB Created: 2021-02-26 00:50:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 567dad8a5aa69e484490a83cdc0a47dc SHA-1: ad9a6dd538a00ef5196621368f2ebdd147ef0f88 SHA-256: 49a04eeec241da415ee63b2d9b05d73a998536a3a0265afc781d2a6e57079612
194 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to PDF documents hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics suggest the document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wix?keyword=call+of+duty+zombies+apk+4shared PDF link annotation
    • http://lololoj.sportsontheweb.net/xisebonofugidema.pdfIn PDF document text
    • http://intekzafast.online/pokemon_cards_for_sale_ebay1ewoq.pdfIn PDF document text
    • https://ritukananikunid.weebly.com/uploads/1/3/0/9/130969552/dezoraf_kosixaraxax_zazipurewipid_dezok.pdfIn PDF document text
    • http://onlinesos.tech/ronald_dworkin_laws_empireqdvzd.pdfIn PDF document text
    • https://cdn.sqhk.co/pidodalatip/ZjjBgef/domino_s_carryout_specials_knoxville.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421217/normal_5fd977789a162.pdfIn PDF document text
    • https://joripipebepif.weebly.com/uploads/1/3/4/1/134131856/wofixesemanog.pdfIn PDF document text
    • https://cdn.sqhk.co/jukunobegabe/jf06gc8/top_up_perfect_world_mobile_vng.pdfIn PDF document text
    • https://pubedazemel.weebly.com/uploads/1/3/4/8/134870130/diganexaz.pdfIn PDF document text
    • https://basalolevezuw.weebly.com/uploads/1/3/1/6/131606508/456278.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496380/normal_602cd8ca6012e.pdfIn PDF document text
    • http://recepty-dd.info/where_is_the_equator_line_on_the_mapf3ksa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449622/normal_5fd9b06fce831.pdfIn PDF document text
    • https://vugesajovor.weebly.com/uploads/1/3/4/2/134265649/256d5358196c.pdfIn PDF document text
    • https://jetebudatupa.weebly.com/uploads/1/3/4/7/134748577/watukipebinave-ronudovobol.pdfIn PDF document text
    • http://letgtma.bid/685964922991ne48.pdfIn PDF document text
    • https://kizifafub.weebly.com/uploads/1/3/4/7/134714450/95a4b000.pdfIn PDF document text
    • http://paktum.pro/black_and_red_ombre_coffin_nails9mpi3.pdfIn PDF document text
    • https://powifamule.weebly.com/uploads/1/3/4/7/134757347/f9bb3c7b964.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zitadufafasid.onlinewebshop.net/a_christmas_carol_short_version_esl.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_off0000e74d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74D 5628 bytes
SHA-256: 981f628d988cb483c37ffa7d0fe08e6ad43e200d44bf151a96e8615e15bb6e61
font_01_sfnt_off0000fa5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5A 14052 bytes
SHA-256: ce4bb45b4bef0607927aea1f74183c6b2def638637153ce4f55d39a6526caff5