Malicious PDF — malware analysis report

Static analysis result for SHA-256 f87c772ff5aa25ae…

MALICIOUS

PDF

76.7 KB Created: 2021-02-13 22:47:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 85a35033594fe6cccf03f899e5d749cd SHA-1: 0389893d209586fd2511fa42c5dd92e122523ef1 SHA-256: f87c772ff5aa25ae8c33085db99b386be99d6341278f8a3f0a670a60cb3d5721
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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/wix?keyword=kulana+bike+company PDF link annotation
    • https://tepogixe.weebly.com/uploads/1/3/1/4/131437844/buxibaruxov-getasuseginat.pdfIn PDF document text
    • https://mebotorafegamor.weebly.com/uploads/1/3/0/7/130739377/8fc7728.pdfIn PDF document text
    • https://jiresuzava.weebly.com/uploads/1/3/4/7/134706808/68a2666d1.pdfIn PDF document text
    • https://cdn.sqhk.co/gusiloxi/ghFOjjP/xarikipifebamewativajode.pdfIn PDF document text
    • http://xuvivok.22web.org/81816503700.pdfIn PDF document text
    • http://tradestaroffice.com/o_pequeno_principe_filme_online2behd.pdfIn PDF document text
    • http://letxxnx.org/free_software_to_modify_documentsdzll7.pdfIn PDF document text
    • https://cdn.sqhk.co/tabakotodi/hfxKwje/84901200640.pdfIn PDF document text
    • http://paringljkf.com/3.4.2.5_packet_tracer_-_configuring_greevl4d.pdfIn PDF document text
    • http://tojiritukimafom.iblogger.org/desert_rose_sting_song.pdfIn PDF document text
    • http://bobr.space/local_tour_guide_in_phuket24elb.pdfIn PDF document text
    • https://cdn.sqhk.co/xexanodu/Tja9ii5/3d_mountain_climb_4x4.pdfIn PDF document text
    • https://kazigujexumakul.weebly.com/uploads/1/3/4/3/134320364/544930.pdfIn PDF document text
    • https://cdn.sqhk.co/jiluputumusi/M7giNF2/56299001903.pdfIn PDF document text
    • http://insurancesouk.com/test_for_q_feverkfttv.pdfIn PDF document text
    • http://montana-media.com/clean_master_apk_full_para_pcfrk8t.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tekabexorita.rf.gd/bug_out_bag_guns.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_off0000f12a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12A 5080 bytes
SHA-256: 059266aef9561f2856fab38719f84a0a2d4754093640f15f991a38b550647c3c
font_01_sfnt_off00010270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10270 10452 bytes
SHA-256: ef53b769deeb204041460148591c516e766b6fd5f8119af24f1e774c4e242202

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