Malicious PDF — malware analysis report

Static analysis result for SHA-256 78bd31408b9b86d8…

MALICIOUS

PDF

84.5 KB Created: 2021-03-02 10:44:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: c746efcd57f490920e6d592c91268b83 SHA-1: 17ba8f1c85563291b5245b3b172d2a87cc633524 SHA-256: 78bd31408b9b86d8de38490ded206c466fe76ab261ae59c9eda12c21c8a0cdb9
116 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF document flagged by ClamAV as a phishing trojan. Heuristics indicate it contains a callback lure, prompting the user to call a phone number in a context of billing or security issues. An external URI pointing to 'fokemale.ru' was also extracted, suggesting a connection to a malicious domain. No scripts were extracted, but the overall pattern is consistent with a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://fokemale.ru/strik?utm_term=who+stars+in+the+crown+season+4 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465252/normal_6037994cdc5ab.pdfIn PDF document text
    • http://tufodudem.mypressonline.com/simple_pencil_drawing_ideas_for_beginners.pdfIn PDF document text
    • http://goxadonivibifiw.22web.org/11369676684.pdfIn PDF document text
    • http://lorewipa.scienceontheweb.net/how_did_europe_clean_up_after_ww2.pdfIn PDF document text
    • http://kukushpa.fun/26782105680zdofe.pdfIn PDF document text
    • http://fomijegi.mypressonline.com/braun_irt3030_thermoscan_3_infrared_ear_thermometer_reviews.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pasutiz/82149149191.pdfIn PDF document text
    • https://s3.amazonaws.com/folexapurilowe/mazuzamupoxe.pdfIn PDF document text
    • https://s3.amazonaws.com/dufekifaral/clipped_horse_blanket_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/lotibabakuj/android_wear_watch_faces_animated.pdfIn PDF document text
    • http://widusop.atwebpages.com/enron_the_smartest_guys_in_the_room_full_movie_youtube.pdfIn PDF document text
    • https://s3.amazonaws.com/fejififimaketo/bijuxekazezitiramaxukugif.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwimadaneb/ximitojomafawepurivoniwu.pdfIn PDF document text
    • https://s3.amazonaws.com/rekawexuretowo/joferegunidakaxi.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_off00010cb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB0 5048 bytes
SHA-256: 4aadb0ec19f38435d5c92b6db304ea301a0f31fb28cb884c8df98d7ed0a8324e
font_01_sfnt_off00011df4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF4 11400 bytes
SHA-256: 3ca34ff54259af47b1902c59ef00d042fd5c10aa75c0393cd880c6b9bf8e108d

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