Malicious PDF — malware analysis report

Static analysis result for SHA-256 9df2ef8f83c87e36…

MALICIOUS

PDF

78.1 KB Created: 2021-03-14 17:20:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 71b4fd579ed151c9b2e271a325ace79a SHA-1: 9f3a3cf345b653a3bc9f07a45ef034bbb510c57b SHA-256: 9df2ef8f83c87e3669ec6ad6258c4a0fd1835441cd8f1af451e782045eb48ef0
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • 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://leonvi.ru/wix?keyword=louise+hay+pdf+download
    • http://basvuruizleme.online/teri_ankho_ka_kajal_dj_song48kp3.pdf
    • http://xinuvaro.sportsontheweb.net/59275822292.pdf
    • http://lnstagram-verifedbadge.com/solar_system_simulator_androidwqwux.pdf
    • http://wiboratiraveguw.mygamesonline.org/ielts_speaking_topic_vocabulary.pdf
    • http://kopalirigel.mypressonline.com/1861834633.pdf
    • http://soldonlakewood.com/whirlpool_front_load_washer_code_f11muo72.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/farefasejikap/96455623076.pdf
    • https://a540aa65-2eb1-4ac3-86d0-bf6a54daac96.filesusr.com/ugd/2d797c_11888020a3324a0296dce10605ce976c.pdf?index=true
    • https://s3.amazonaws.com/resisuna/jayco_owners_club_queensland.pdf
    • https://f608bf75-187c-4b28-9621-af925c05c2b6.filesusr.com/ugd/05e3ad_8c9561ecc7164dbfbe9ebf9b15acdeb0.pdf?index=true
    • https://557345b1-98c6-442d-b460-9e357c178e5b.filesusr.com/ugd/dfb5f8_5460c13512e54c2991effba5385bbcc5.pdf?index=true
    • https://be1d055c-b83b-422e-9e68-1bf13cef350c.filesusr.com/ugd/5b1e3c_a3e344ecf4724b1fac4a3cbca9988f96.pdf?index=true
    • https://s3.amazonaws.com/gofilafixu/apache_ant_1._7._0_free.pdf
    • https://uploads.strikinglycdn.com/files/3627ef69-698f-47ca-a9a8-5d7b25549829/what_is_36_months_in_age.pdf
    • https://f26e6bca-ce10-4524-9610-ed5ef7c8d48b.filesusr.com/ugd/ac8c68_03db91a83e24464187ff7d9d77bf6b1b.pdf?index=true
    • https://8d40832c-2e2b-4284-8151-bb35a16d80ac.filesusr.com/ugd/05d014_db3f0d5a79c74cddbc9a15c29685bb9b.pdf?index=true
    • https://s3.amazonaws.com/vavejijitatofu/96688632554.pdf
    • https://uploads.strikinglycdn.com/files/255b88ec-7446-479b-bb8e-0172fb53cc65/curse_of_the_azure_bonds_book.pdf
    • https://ddb0fe67-a09a-413d-b59a-c21b1dde3186.filesusr.com/ugd/3f0e57_95b97c4783d649c3a45da157dd5c2c19.pdf?index=true
    • https://ddd90330-5837-4e0c-b2f6-9383941cd2db.filesusr.com/ugd/568e2c_4c3bba1891ff46278174b5cad00193c6.pdf?index=true
    • https://ef9935f7-a918-44a1-999f-f1d50a45e4a7.filesusr.com/ugd/b463f2_a8b3a09d4cf44fd9ad96295869c473e3.pdf?index=true
    • https://b70645e9-42d7-44c6-80f2-f165c8819e8d.filesusr.com/ugd/3f1130_ab77bec3303a4e60ba1e7dd1595fcfa6.pdf?index=true
    • http://rususekobijo.myartsonline.com/subuto.pdf
    • https://uploads.strikinglycdn.com/files/cc16d652-f941-4290-abf1-22d83636a657/buribepowa.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1c6.bin
965fef24c67967b5a0d27b19c138909914171e0931042028dcad3f94b73016ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C6 5168 bytes
font_01_sfnt_off0001037d.bin
b62cfd20c9729af801c2c97bb8a2f199705bcc6b11bcd03448cad9a152712a35		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1037D 12396 bytes

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