Malicious PDF — malware analysis report

Static analysis result for SHA-256 f490377c47d782a8…

MALICIOUS

PDF

71.7 KB Created: 2021-04-24 13:58:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4200cb72e35243ce62e2387de28ce51 SHA-1: 3128410dbed2fa4c0fe1032fc2ca71d41bd2bcb0 SHA-256: f490377c47d782a8213d6f9d818ec2fce73d8166ec232f31adc118b4b3385084
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, and exhibits characteristics of a link farm. The presence of external URIs and the overall structure suggest an attempt to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pelibifir.ru/strik?utm_term=are+there+2+the+shining+movies
    • http://ighelpcenter.xyz/gym_program_for_beginners_male_skinnyost94.pdf
    • http://fizarumokugafu.mywebcommunity.org/90083243028.pdf
    • http://milanomoda.site/705492044388x82u.pdf
    • http://koxelovanalimu.getenjoyment.net/how_to_calculate_the_moles_of_each_element_in_a_compound.pdf
    • https://jurujixomegisi.weebly.com/uploads/1/3/4/7/134745805/luteloja.pdf
    • https://vupixesit.weebly.com/uploads/1/3/2/7/132740805/virugoponid_wavozol_popuwawekobomom.pdf
    • http://piwulag.sportsontheweb.net/zobagajok.pdf
    • http://ig-verifiedsbadge.com/747622445910fpyb.pdf
    • http://maxiteguf.medianewsonline.com/advanced_excel_version.pdf
    • http://jopagozopive.medianewsonline.com/what_is_a_quiet_noise_level_for_a_dishwasher.pdf
    • https://pupewofitesog.weebly.com/uploads/1/3/4/7/134771191/xovezuzavo.pdf
    • http://ruzamaji.getenjoyment.net/mp_b._ed_entrance_exam_syllabus_2020.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zuvemodu.rf.gd/94370500331.pdf
    • http://mugomodag.atwebpages.com/robunumetovu.pdf
    • http://lavapokapajemob.myartsonline.com/kovatopusup.pdf
    • https://s3.amazonaws.com/wulagisi/88066629776.pdf
    • https://s3.amazonaws.com/gizonukorad/aashiqui_2_audio_song_in_tamil.pdf
    • https://s3.amazonaws.com/simujix/87336944080.pdf
    • http://sufizaj.rf.gd/gopexoxigukojuwam.pdf
    • http://bitenozof.atwebpages.com/21829173718.pdf
    • https://s3.amazonaws.com/pasawexawinogad/62848276738.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_off0000dd59.bin
a8d982f8095051a725844c52139474e4c1679475ce32f65cb9ac6c059e02a081		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD59 5036 bytes
font_01_sfnt_off0000ee5d.bin
7dde1e7498bac1f2b8a3212f3912517dc5f3f459cdec478bba2f283f2d998bca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5D 10340 bytes

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