Malicious PDF — malware analysis report

Static analysis result for SHA-256 9049d941d92d1182…

MALICIOUS

PDF

74.5 KB Created: 2021-01-15 05:49:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 817a4c3afde0d24e215438d72c3204ff SHA-1: c5df8d077882d0af1091b72fb841e9e365f7c341 SHA-256: 9049d941d92d11825e529b894a27f102315176932c09dd6f3425af24dd83e490
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting an attempt to direct users to potentially malicious or spam content. The presence of an embedded URL and the ML classifier's high confidence score further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution attempt.

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 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.
  • 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://trafffe.ru/123?utm_term=tales+of+vesperia+grade+shop+battle+techniques PDF link annotation
    • https://site-1173730.mozfiles.com/files/1173730/67292128987.pdfIn PDF document text
    • https://wexanamu.weebly.com/uploads/1/3/1/4/131411474/751d29c8d24e5.pdfIn PDF document text
    • https://widowajezow.weebly.com/uploads/1/3/4/5/134584852/7681609.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417643/normal_5fd330b0ea351.pdfIn PDF document text
    • https://site-1173209.mozfiles.com/files/1173209/dinosaur_rampage_hack_mod_apk.pdfIn PDF document text
    • https://site-1176575.mozfiles.com/files/1176575/new_greatest_hits_albums_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505159/normal_5fea35ee248a9.pdfIn PDF document text
    • https://teregurejojexol.weebly.com/uploads/1/3/4/8/134879353/2869590.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/pegek/44763674737.pdfIn PDF document text
    • https://s3.amazonaws.com/jaxesabi/brothers_of_jesus.pdfIn PDF document text
    • https://s3.amazonaws.com/wovitiku/fosejelabin.pdfIn PDF document text
    • https://s3.amazonaws.com/voxazedisula/pronoun_antecedent_worksheet_grade_4.pdfIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/agricultural_economics_research_review.pdfIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/80532722960.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d91b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91B 5576 bytes
SHA-256: 7c2fdacdbb60c8599f2575bdeeed9961c71eb8f607a0d42a31a3563740d21bd0
font_01_sfnt_off0000ec03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC03 10108 bytes
SHA-256: fde11c62cee436a71824ba85e10996b7ca9ab5527c297f433751254a0a7ca97e
font_02_sfnt_off00010ead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAD 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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