Malicious PDF — malware analysis report

Static analysis result for SHA-256 afbbf5be846ac4fb…

MALICIOUS

PDF

87.0 KB Created: 2021-03-09 21:10:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c134141cbbed766a9335c46b5b307634 SHA-1: cca74eeeb01a067268ed6013867adcf01cea7330 SHA-256: afbbf5be846ac4fb2e155ed100008d078bb13b082eff072496f422772728fdd2
116 Risk Score

Malware Insights

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

The file is a PDF document flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. The heuristic 'SE_CALLBACK_LURE' indicates the document's content is designed to trick users into calling a phone number, a common tactic in tech-support scams or callback phishing. The embedded URL, https://pelibifir.ru/strik, likely serves as a landing page or part of the phishing infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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=thinking+for+a+change+class+houston PDF link annotation
    • http://zemimumaloger.iblogger.org/23768123091.pdfIn PDF document text
    • http://tujokatoxeg.22web.org/the_plague_albert_camus_audiobook.pdfIn PDF document text
    • https://cdn.sqhk.co/tajiwikiter/ihicIja/69673547032.pdfIn PDF document text
    • http://kixiwogazu.sportsontheweb.net/la_catedral_del_mar_season_2.pdfIn PDF document text
    • http://fogatevemawe.22web.org/guruzerabivufil.pdfIn PDF document text
    • http://wigageturuv.mywebcommunity.org/alice_in_wonderland_read_online.pdfIn PDF document text
    • https://cdn.sqhk.co/jisokemefaz/hCjbiau/75446459605.pdfIn PDF document text
    • https://cdn.sqhk.co/sevigexew/hiSfugg/62746659108.pdfIn PDF document text
    • http://gagimubu.mywebcommunity.org/75507920678.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zinezalidoratov.rf.gd/wagipukebozekibepi.pdfIn PDF document text
    • https://s3.amazonaws.com/muxozuvalubi/vulazitame.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxepiduded/bubble_shooter_5_apkpure.pdfIn PDF document text
    • https://s3.amazonaws.com/begijufadi/genetically_modified_food_crops.pdfIn PDF document text
    • http://zufonokimilije.epizy.com/waxadedabavanejabe.pdfIn PDF document text
    • http://japinoxizidunub.myartsonline.com/letter_of_credit_example_doc.pdfIn PDF document text
    • https://s3.amazonaws.com/vavapekadoliti/getakepiludonika.pdfIn PDF document text
    • http://nasewuji.epizy.com/sezigoxakepo.pdfIn PDF document text
    • http://nupopagiwagivu.epizy.com/6792022391.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee3afa78-8b51-4b74-94ef-3c9f04f540be/50855720550.pdfIn PDF document text
    • http://muvusibose.rf.gd/91827591675.pdfIn PDF document text
    • http://verulufana.rf.gd/how_to_arrange_descending_order_in_excel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1dd4f8f2-9b74-4249-82ae-3f3fd5cf0750/what_is_transcendental_meditation_christianity.pdfIn PDF document text
    • http://dejovosag.epizy.com/binomial_expansion_worksheet_tes.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_off000114e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E7 5156 bytes
SHA-256: ff463e7ed2cae11fa0407911b164efa5cc62ad2e87d995650afbd729a86413c1
font_01_sfnt_off00012672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12672 11868 bytes
SHA-256: b66610fcaa9bbaeb838f9578857fe59fb54aa300dad56a4a079b868cdc6bbba2

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