Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca6e88e67d482fdf…

MALICIOUS

PDF

74.5 KB Created: 2021-04-24 22:16:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 83e456456217d622434eb6378c51d5fe SHA-1: 2c79d6660c58ed577d18a3a04621b907f507891b SHA-256: ca6e88e67d482fdf7afb543dd865ce38cd1eadf891efd807670ca64590829b13
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URIs, with a notable one pointing to 'https://maypoin.ru/strik'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the PDF is designed as a link farm on disposable hosting, further supporting a phishing or malware distribution attack pattern. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://maypoin.ru/strik?utm_term=how+to+get+certified+to+teach+eyelash+extensions PDF link annotation
    • http://fekijijiz.iblogger.org/23961156885.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368497/normal_605a551fa3341.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373517/normal_5fdad36a3a7a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452372/normal_606dd079a32b3.pdfIn PDF document text
    • http://pasiworuwiwoz.getenjoyment.net/beraginaxudugaxalawaxasi.pdfIn PDF document text
    • http://lazirawolewok.getenjoyment.net/20853904691.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368953/normal_6069fbd108e60.pdfIn PDF document text
    • http://delojenopow.66ghz.com/virajabubaguradono.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gogidovegesoxe.epizy.com/68949332631.pdfIn PDF document text
    • https://354df738-7a8c-4643-bdcd-aa58f7c4bd0c.filesusr.com/ugd/69cf62_9d0d611d706940e89461532e61db9333.pdf?index=trueIn PDF document text
    • http://tavoxelelenasi.onlinewebshop.net/64583155390.pdfIn PDF document text
    • http://tetomor.rf.gd/julodupexu.pdfIn PDF document text
    • http://remoloki.epizy.com/is_samsung_series_6_tv_4k.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c986c123-3080-4a0b-8915-72fbf5d5baa3/what_is_group_theory_used_for.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/905e6918-d27b-4202-a460-4c50daf9c25f/grendel_by_john_gardner_setting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e241772b-a9d9-4afa-8f76-6c914b2ee3a1/69701414141.pdfIn PDF document text
    • https://78832258-a450-4746-8c2e-8ebd7c1eaafe.filesusr.com/ugd/c4f63d_1a0fa21bb60b4b7f8777065a16317fbe.pdf?index=trueIn PDF document text
    • http://sujetokotew.rf.gd/philips_avent_steam_steriliser_manual.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_off0000e36f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36F 5508 bytes
SHA-256: a7f5af7d9cefdd75e6c2f565979934d30d89e333e473de3a00e49c645fbc5134
font_01_sfnt_off0000f642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF642 10884 bytes
SHA-256: 4e770a8c307b7fbe4a538dbd62ebaf3e9a62eb17c6b9bd577c4e7c087a64d96c

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