Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa751dd469c5d75e…

MALICIOUS

PDF

99.5 KB Created: 2021-03-17 05:56:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 3b3ef56a5031853c7d5d467328c5bb50 SHA-1: c2174f4ca5595c853496ee2bc92548e73b8345ed SHA-256: fa751dd469c5d75e32e2721653fe74c250f4e67efeb6fe1aae09d838968f305b
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URIs, with one pointing to 'nipisod.ru', which is flagged as suspicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were extracted, the presence of numerous external links suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://nipisod.ru/wix?keyword=describe+a+non-political+revolution PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4453889/normal_5fe0a8751f715.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388046/normal_5ff2817e4842f.pdfIn PDF document text
    • http://feelslike35.com/98843999873qlpnr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447669/normal_5fce6acf977cf.pdfIn PDF document text
    • https://cdn.sqhk.co/nezerozara/jggcifL/zogokiloxivuwewik.pdfIn PDF document text
    • https://cdn.sqhk.co/zurefaxenov/7jc2gjL/gevuliwexuram.pdfIn PDF document text
    • http://chistohome.moscow/yo_tengo_tu_love_ukulele_tutorial1ghjs.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381287/normal_5fce78e05ad25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450259/normal_5fe853af46fdc.pdfIn PDF document text
    • http://1xbet-registr.site/ziwupic2p9m.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://uploads.strikinglycdn.com/files/addb6407-f06d-48d5-b515-f45af2924432/what_army_units_are_considered_special_forces.pdfIn PDF document text
    • http://zilokujidetomo.epizy.com/gurogekorejori.pdfIn PDF document text
    • http://xakireponamo.rf.gd/assoluto_racing_hack_apk_2017.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6648c6a8-8faa-4969-8b24-c27c35c7a487/mythology_edith_hamilton_chapter_3_summary.pdfIn PDF document text
    • https://66c7139a-03c0-45fe-98d3-e817d1e01442.filesusr.com/ugd/de2db5_6ff071433b6244a6a2e025643984d44b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/52e0f188-5b98-48c6-a83b-42b272395b97/vavodonebifex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aadd81bb-8067-45a0-b9b1-853c92504b31/32593932448.pdfIn PDF document text
    • https://2ea9429b-0332-4ee6-bb75-ab9535b56c99.filesusr.com/ugd/e2f7e1_af2bf73c4823437695139502582fae92.pdf?index=trueIn PDF document text
    • http://demuremapinob.epizy.com/dekuzir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2061e606-b34f-4185-9d2e-a4f4a743ae17/jatarefakuwoperikogeke.pdfIn PDF document text
    • https://af18ad75-7652-4b25-b9e0-8da5fded0af1.filesusr.com/ugd/529385_3f59069f84aa423b97896fdc5976b50c.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013a48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A48 5040 bytes
SHA-256: 548156951e0f266880c405047be83e9bac5ebcf33d9ce5548a7830f39d447762
font_01_sfnt_off00014b7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B7E 12024 bytes
SHA-256: 6e7fb1e25f894254903f0ef2b526b3de78dde2b8d918f750e960b8e47ef5a9c1
font_02_sfnt_off00017288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17288 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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