Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c4d65ee52418ce9…

MALICIOUS

PDF

70.3 KB Created: 2021-01-16 15:00:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 513bce9c5f99f421d7481eadcc9fb1bd SHA-1: d8254f87b8d59b3081d2d73a9233f8bdb61cfdf9 SHA-256: 5c4d65ee52418ce94a82ebdc35392b97702d4881a97fdb223c77eed0e45b5d0c
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one critical heuristic identifying it as a redirector link pointing to malicious infrastructure. Another critical heuristic flags it as a link farm, suggesting a large number of outbound links intended to direct users to potentially harmful sites. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/123?utm_term=galaxy+s5+weather+widget+apk In PDF document text
    • https://didavetamij.weebly.com/uploads/1/3/4/3/134320859/4477865.pdfIn PDF document text
    • https://vodexekuteb.weebly.com/uploads/1/3/0/7/130776001/pasimememiziw.pdfIn PDF document text
    • https://surugodinatuv.weebly.com/uploads/1/3/4/8/134861851/sowefusazebulosubib.pdfIn PDF document text
    • https://cdn.sqhk.co/goluxewimabu/hiicVdi/loliwujelosikeruwax.pdfIn PDF document text
    • https://mojipolizu.weebly.com/uploads/1/3/4/3/134318612/silajifirene.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/simujix/house_rental_agreement_format_in_english_doc.pdfIn PDF document text
    • https://s3.amazonaws.com/satedafadusizo/aac_bricks_manufacturing_process.pdfIn PDF document text
    • https://s3.amazonaws.com/zuvovoxigumuz/codigo_promocional_altaid_formacion.pdfIn PDF document text
    • https://s3.amazonaws.com/baxunaf/how_to_make_burnt_orange_frosting.pdfIn PDF document text
    • https://s3.amazonaws.com/rebomedug/48109795815.pdfIn PDF document text
    • https://s3.amazonaws.com/belopudevuzuza/the_color_of_the_law_book_review.pdfIn PDF document text
    • https://s3.amazonaws.com/pokixovuxik/81661586373.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_off0000d28c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD28C 5700 bytes
SHA-256: 11aa493960752e2d0179cdf60f1217afb5ebb0506059c5e681a027ccdb0d00c5
font_01_sfnt_off0000e614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE614 11436 bytes
SHA-256: f60858517c32026aabd4cda60b167749cd2394db1a922653a5b844eed10e6950

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