Malicious PDF — malware analysis report

Static analysis result for SHA-256 526e8fbb4f016b64…

MALICIOUS

PDF

81.6 KB Created: 2021-03-19 22:29:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: dff44f8c6ad99b7b771dd9b37122e715 SHA-1: 44a7f31b2e83998d93dbea28ac9f8236a11166f1 SHA-256: 526e8fbb4f016b64fcc951d4b7192fa0017cbde742ed6c887fec40a0907b5b3e
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, suggesting it's part of a link farm designed to drive traffic to potentially malicious or phishing sites, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The document body's reference to 'Playstation messages apkpure' is likely a lure to attract users to click on the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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://zajinet.ru/wix?keyword=playstation+messages+apkpure PDF link annotation
    • http://leopolds.space/character_strengths_and_virtues_surveyfzyh7.pdfIn PDF document text
    • http://ligovezedeje.iblogger.org/games_not_in_play_store.pdfIn PDF document text
    • http://mesretly.xyz/texavepidobofolosezuwl74x5.pdfIn PDF document text
    • http://meetsoda.pro/40144292729koka7.pdfIn PDF document text
    • http://xrootunited.com/wordly_wise_book_1ec82e.pdfIn PDF document text
    • http://zanartcc.net/82051824855xl1rr.pdfIn PDF document text
    • http://plafond.xyz/how_to_turn_off_emergency_heat_on_trane_thermostatzzdby.pdfIn PDF document text
    • http://smartycredit.info/xugogavawebod3373.pdfIn PDF document text
    • http://gajozemexip.22web.org/zegalelugotogutumumaros.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://f19d2187-ce67-4d04-8798-eef694565169.filesusr.com/ugd/bd4746_95b70395b079426cbcf36aa8f1f82bb1.pdf?index=trueIn PDF document text
    • http://zubidoziradep.rf.gd/50742594146.pdfIn PDF document text
    • http://bipunasozusi.epizy.com/brussels_travel_map.pdfIn PDF document text
    • https://b3dfd9c9-1030-471f-a26d-814ea73dbccc.filesusr.com/ugd/d97afa_a287930dd2a94a399d569bb92b0eea3f.pdf?index=trueIn PDF document text
    • https://13fad4bf-7224-44b3-802b-16842e97d241.filesusr.com/ugd/b14664_160057dcfa3c4e82b7717c9dcecf8c2f.pdf?index=trueIn PDF document text
    • https://1350f94c-8d6f-42b4-8351-24983ad6a49a.filesusr.com/ugd/4aae87_1852242e3f1246c7a2e8fd9762721eaf.pdf?index=trueIn PDF document text
    • https://8c56b32b-3398-45d6-9c0b-b55146621f16.filesusr.com/ugd/6924eb_edd9dbe16e2e40b7968beab08e5b04e8.pdf?index=trueIn PDF document text
    • http://redepulevinevux.epizy.com/inclined_plane_problems_with_answers.pdfIn PDF document text
    • https://bad3f395-1638-4667-b349-d6f934eeab49.filesusr.com/ugd/ed2d23_e555e0a872d54ebdb489eb759a8eed09.pdf?index=trueIn PDF document text
    • https://00eaa6b3-f026-4720-b00f-fafb40066352.filesusr.com/ugd/d498be_1208672d94ec4355900740b8512ed3d9.pdf?index=trueIn PDF document text
    • https://183df7f2-4185-4ca0-bfcc-33b39bc842f1.filesusr.com/ugd/9ac34a_2394af6d0a8e4913a8712a139dc3ae9b.pdf?index=trueIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD807 7868 bytes
SHA-256: c6727c5cabb5cc2398acbf3bee1d43f858944974b0e34f76ea357b940f949f89
font_01_sfnt_off0000f256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF256 5188 bytes
SHA-256: 2dc737593c9ec0a44d9e523bb1e55c4261bb851c7dd92912caf27245e81eab59
font_02_sfnt_off000103f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F0 11328 bytes
SHA-256: 73e44aec560783fdcbc8b6974e7185f4f81cf91a61c95c984301c6fe5d072d86
font_03_sfnt_off00012892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12892 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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