Malicious PDF — malware analysis report

Static analysis result for SHA-256 a22902c96bf347aa…

MALICIOUS

PDF

76.9 KB Created: 2021-03-16 08:56:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: e61271c6a8e785fbd941282c1b5c1ebe SHA-1: 577616793a355a0d1521968010b81e4df5fac934 SHA-256: a22902c96bf347aafa54d5c5c9a16844efc681831691c47e74a442c19a429567
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious domains, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, appears to be a lure related to a 'Bloodborne walkthrough pdf'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/award?keyword=bloodborne+walkthrough+pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4377912/normal_5feead415b96f.pdfIn PDF document text
    • http://options.expert/libro_los_generales_de_dios_1_gratisbsz0h.pdfIn PDF document text
    • http://littlenat.space/48393944553lcjr3.pdfIn PDF document text
    • http://summer-italy.fun/gipsy_kings_hotel_california_guitar_pro80z9m.pdfIn PDF document text
    • http://com-connexion.xyz/xomipoxusa0e537.pdfIn PDF document text
    • http://triple-doska4.club/memigambpic.pdfIn PDF document text
    • http://vizionsmc.net/96984790376h8plo.pdfIn PDF document text
    • http://lnstagram-helps-contact.com/8049701343u5404.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417531/normal_602a3caca47f0.pdfIn PDF document text
    • http://roflan.site/90343649894em19a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ba50db2-baa1-445a-9d28-cb9246defc82/sifapobesobazi.pdfIn PDF document text
    • https://s3.amazonaws.com/ninasivol/28636315817.pdfIn PDF document text
    • https://s3.amazonaws.com/xewamejixolefaj/sizovubax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53e92509-f9a3-4ed0-864d-072e97ade08b/49472437097.pdfIn PDF document text
    • https://s3.amazonaws.com/mejobu/zawujamemozigifumetunof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c386e10-f7ed-4d4a-a808-7cc0e09df2f6/kusejumolibuberemux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90c3a236-2fd2-413a-8242-9b47490b93f6/48349107790.pdfIn PDF document text
    • https://s3.amazonaws.com/vazisi/blank_horizontal_bar_graph_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7419bfd1-a065-4a24-bb28-404c3264f75f/xixoragib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6e97ffd-a144-4282-aa2d-c01db500c994/examples_of_irregular_verbs_with_past_present_and_future_tense.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea269c26-4067-4a31-9081-3df9e09c4950/68644440068.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_off0000ecec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEC 5468 bytes
SHA-256: 13a37b1975f83cbe953f841bbe099a12ae194a97c15a5ca477af4f3f2646286b
font_01_sfnt_off0000ff96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF96 11588 bytes
SHA-256: c3de9498a900b3b0e9974920322f2731b05a9d616347ba78c557a3902f0ac10e

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