Malicious PDF — malware analysis report

Static analysis result for SHA-256 728b665c3b37abd0…

MALICIOUS

PDF

79.6 KB Created: 2021-01-10 01:28:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 51cbc4f925ecf2a74aece44238e3afcb SHA-1: ec216753f62f1e74b921fd314ec03624c9d0a594 SHA-256: 728b665c3b37abd0566609674548df700d8fbf03bbd9f2958eb77a42d80508b3
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to S3 buckets, suggesting a link farm or redirection strategy. The ClamAV detection and ML classifier indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URIs 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://trafficel.ru/123?utm_term=institutions+of+state+power PDF link annotation
    • https://tuzidatawuno.weebly.com/uploads/1/3/4/9/134902979/lirosedixibiru.pdfIn PDF document text
    • https://cdn.sqhk.co/tokexinolelu/tgemje4/sms_messages_collection_apk_download.pdfIn PDF document text
    • https://site-1166600.mozfiles.com/files/1166600/zewizemadotibewixip.pdfIn PDF document text
    • https://fojuxiwo.weebly.com/uploads/1/3/2/6/132695505/2221776.pdfIn PDF document text
    • https://site-1166749.mozfiles.com/files/1166749/jabaxogudovarijadur.pdfIn PDF document text
    • https://site-1174183.mozfiles.com/files/1174183/58482617784.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/midipes/jubefosodinokexeze.pdfIn PDF document text
    • https://s3.amazonaws.com/vixuwogetiv/13846434403.pdfIn PDF document text
    • https://s3.amazonaws.com/potofaw/votarulepezavoponiworuw.pdfIn PDF document text
    • https://s3.amazonaws.com/miledu/vector_calculus_equation_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/juvuraguvutoxif/enteral_nutrition_aspen_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/lerezazo/mazeradivupabo.pdfIn PDF document text
    • https://s3.amazonaws.com/viromibukoleliw/capitalization_worksheets_seventh_grade.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_off0000fae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE9 4892 bytes
SHA-256: 4aecf134bc33e9e8e36cbd45eee28ef4da43b57d437dd8519c9cf0dbbe8072b2
font_01_sfnt_off00010bb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB2 10616 bytes
SHA-256: cd6478bbd3896f1f03c3f05d054b310640904fefa8612a4690f81055c3e9692a

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