Malicious PDF — malware analysis report

Static analysis result for SHA-256 628472d72d0cb6ac…

MALICIOUS

PDF

72.8 KB Created: 2021-01-17 23:17:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: d36d9cce96932cfb0dbca8e034620d34 SHA-1: d35aa13b6bf840f5e19b98e884200932e4459607 SHA-256: 628472d72d0cb6acb622b5cf92b8fc440831953cec41bf603529290b85bae468
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, indicative of a link farm or phishing campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically related to phishing. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a tactic of redirecting users to potentially malicious websites.

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
  • 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://traffset.ru/123?utm_term=carbon+fiber+money+clip+with+id+window PDF link annotation
    • https://xujeloza.weebly.com/uploads/1/3/4/0/134096435/gudoduvozapuzagalene.pdfIn PDF document text
    • https://figapizezedop.weebly.com/uploads/1/3/4/3/134364787/a72eb7d.pdfIn PDF document text
    • https://cdn.sqhk.co/pomorezolo/iaggi8z/16423177811.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473622/normal_60018d01566b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484805/normal_5fd9a063439f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379839/normal_5f903b9149fad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401538/normal_5fc4ab2d3349e.pdfIn PDF document text
    • https://vukumurumijolot.weebly.com/uploads/1/3/4/4/134433046/bidaxuge.pdfIn PDF document text
    • https://bozozojiretul.weebly.com/uploads/1/3/4/7/134770512/zezeje.pdfIn PDF document text
    • https://sujixiku.weebly.com/uploads/1/3/0/7/130739139/zogarum.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/woxotopapozokev/97056778723.pdfIn PDF document text
    • https://s3.amazonaws.com/betefowubevat/blank_answer_sheet_1_150.pdfIn PDF document text
    • https://s3.amazonaws.com/dukajevo/fourier_transform_of_a_bessel_function.pdfIn PDF document text
    • https://s3.amazonaws.com/simujix/rupelir.pdfIn PDF document text
    • https://s3.amazonaws.com/votuweroxigezog/xutapodixegabogur.pdfIn PDF document text
    • https://s3.amazonaws.com/zupenafud/love_island_game_rated_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/jemisajoda/collision_reporting_centre_toronto_wait_times.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_off0000e067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE067 5456 bytes
SHA-256: 73c762dbbbb33089c747d6e0f31bae2a552c223310359d12d4f03fedc30ed0e9
font_01_sfnt_off0000f2de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DE 10292 bytes
SHA-256: 1ec8ce06a6f17581f40fd33b0906d39e539d13c5850fd1eda96e77393c290db9

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