Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa4371aeb5aa82b0…

MALICIOUS

PDF

73.9 KB Created: 2021-03-19 05:28:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b39997aba41ba1fb09e49059e1f74cf2 SHA-1: c71070f3af4c72686f37120eceaee412ebe6b32b SHA-256: fa4371aeb5aa82b0bee1120ff94d1e40f2913f939362540fc6918c6645e5d94a
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many of which point to disposable hosting or are part of a link farm designed to manipulate search engine results. One of the embedded URLs, 'https://yafferge.ru/wix?keyword=boxhead+zombie+wars+2+player+unblocked', is identified as a malicious redirector. This suggests the document is intended to lure users to malicious sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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 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.
  • 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://yafferge.ru/wix?keyword=boxhead+zombie+wars+2+player+unblocked In PDF document text
    • https://cdn.sqhk.co/gesafafo/bhaihgi/9274137872.pdfIn PDF document text
    • https://cdn.sqhk.co/rajemaramiw/hggf7Cg/download_driving_zone_2_mod_apk_android_1.pdfIn PDF document text
    • https://cdn.sqhk.co/rixutixim/ijHijhc/88392056410.pdfIn PDF document text
    • http://vovpomnim.ru/zipizulaxubuz1p3t.pdfIn PDF document text
    • http://delifeschool.com/loseleveburuvonamewibiz44bpy.pdfIn PDF document text
    • https://cdn.sqhk.co/vuvupewog/ads9HPx/61953594851.pdfIn PDF document text
    • https://cdn.sqhk.co/repejuvovod/N5hj6Nm/10_000_the_dice_game.pdfIn PDF document text
    • https://cdn.sqhk.co/sozonexof/hgKEujf/43419266336.pdfIn PDF document text
    • http://stat-index-co.com/guwazuvigiveuouxx.pdfIn PDF document text
    • https://cdn.sqhk.co/budotedo/jfh0JOx/zapaxijimu.pdfIn PDF document text
    • https://cdn.sqhk.co/pafatewodoju/bifYsii/donobubowazoxifakoxiro.pdfIn PDF document text
    • http://kartaidatodemeleri.com/pride_and_prejudice_summary_chapter_9-12fypl7.pdfIn PDF document text
    • https://cdn.sqhk.co/nedupugifuka/Kdgjfjd/xuzasajowokekenades.pdfIn PDF document text
    • https://cdn.sqhk.co/kewixoretuze/cG4ghSs/pixel_art_maker_download_free.pdfIn PDF document text
    • http://mikrotikwizard.com/sigma_bc_16.12_setuppg0wj.pdfIn PDF document text
    • https://cdn.sqhk.co/gufulixofoma/OL7R1ib/third_law_of_thermodynamics_example_problems.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1237a3da-0b33-4890-9ba9-974507bf2590.filesusr.com/ugd/3e0cb9_02046cb24ba54dc985a56a4bf5b8a6c6.pdf?index=trueIn PDF document text
    • https://b9eb3541-094c-4606-b101-17c2291fd6e1.filesusr.com/ugd/a18601_eb65c20dd36d4e89967a2470bbef8330.pdf?index=trueIn PDF document text
    • https://858e1da1-ad31-4e5b-aec0-89c59c6c71f6.filesusr.com/ugd/6240f8_cbabbe1c58ac4c89b209dd8f271304c1.pdf?index=trueIn PDF document text
    • https://6c8ebe11-725c-420b-823a-68bc39d02ad2.filesusr.com/ugd/3e87bf_4f8ab1d41bfe4d9dbc4a2654c9f17546.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tobaziw/emotional_words_that_start_with_a_to_describe_someone.pdfIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/42683047227.pdfIn PDF document text
    • https://s3.amazonaws.com/risalenefazozo/honey_bee_swarm_trap_diy.pdfIn PDF document text
    • https://19508648-7f28-415f-8121-b57715dc1465.filesusr.com/ugd/9734e7_17ad6ccaf47b4df38764f6a8077a90ac.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zabejuvijolu/zusipinivuniku.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_off0000e084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE084 6012 bytes
SHA-256: 9d97cbb32738b2609ebc80fffa213e962302a560e11946556e89f089d75fda59
font_01_sfnt_off0000f4f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F5 11092 bytes
SHA-256: d9679e0df8847e036097852d5cde1975e7b4b59ea04191c31443be7ec1467658

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