Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f23eb46d7eb5bc9…

MALICIOUS

PDF

73.5 KB Created: 2021-03-18 13:56:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 01ae39a43f115c5633d11581eae59e11 SHA-1: 8918e21090c484cd598d96ac7e17bb7246b1d775 SHA-256: 6f23eb46d7eb5bc96108cff4057af7a31fcb09a046a00d1af9ba60e790b773a5
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The document body, though heavily obfuscated, contains text related to 'book on synonyms and antonyms pdf', which is likely a lure. An external URI pointing to 'pelibifir.ru' was extracted, suggesting the document's intent is to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/123?utm_term=book+on+synonyms+and+antonyms+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365541/normal_6026894cc4a1d.pdfIn PDF document text
    • https://cdn.sqhk.co/fiporalisu/gejighb/turbo_boat_racing.pdfIn PDF document text
    • https://cdn.sqhk.co/detaludolef/dBhdXge/attack_on_titan_eren_voice_actor_japanese.pdfIn PDF document text
    • https://cdn.sqhk.co/tajavujexiz/9ghifjR/cooking_life_fever_cooking_madness_cooking_games.pdfIn PDF document text
    • https://cdn.sqhk.co/fedefuxu/hbibChl/37421989007.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369499/normal_600ba64c769ce.pdfIn PDF document text
    • https://cdn.sqhk.co/zuxifobiro/hAUqhcv/xewerokodulejuxulojuwokus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368975/normal_5fd2c8c2afd5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489245/normal_60183d5d94443.pdfIn PDF document text
    • https://cdn.sqhk.co/guwaloxipete/z05gekB/fake_gps_para_ios_pokemon_go.pdfIn PDF document text
    • https://cdn.sqhk.co/reretukida/HeiiHja/texas_dmv_reverse_license_plate_lookup.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0e733887-fd72-4d21-8b10-0a39cafbc931.filesusr.com/ugd/1e4d10_5ee80a765661407381433bc07e39e794.pdf?index=trueIn PDF document text
    • https://1ffb5d6c-d890-49e0-9b87-dc10fbfa49e2.filesusr.com/ugd/8bc2a6_0533f52e58af4c6588b900a402f83735.pdf?index=trueIn PDF document text
    • https://cf62593c-3f62-494e-9ef9-3c2a63ead7d7.filesusr.com/ugd/93dae2_5a2ea3d82b9d480fae03a448eba5c662.pdf?index=trueIn PDF document text
    • https://27a83426-c768-4525-a63d-b5b732cca755.filesusr.com/ugd/28b3f7_cc9edf0ef0d8458ca03cab24346d6730.pdf?index=trueIn PDF document text
    • https://058da8ce-bb30-4b8c-81eb-8903018cac65.filesusr.com/ugd/ab745b_cbc2121fe208490291b21bb051fd756b.pdf?index=trueIn PDF document text
    • https://e082b6be-64c0-45f6-a8ff-82b9c6f476f0.filesusr.com/ugd/1479de_9311c77d7db14baf8fc0d3946791512b.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE036 5276 bytes
SHA-256: 6a68eaca8148ed55070f69a253f7fc10c20adb7544709a7679db1630e64ae033
font_01_sfnt_off0000f22b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22B 10856 bytes
SHA-256: 760988cf2671c9029570968eb2395ab080a365d74eb6adc42f6fd15d8856836a

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