Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb6c74217db81fd0…

MALICIOUS

PDF

73.6 KB Created: 2020-11-23 06:58:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 81481a8764eceb391734f2b1dcf953d8 SHA-1: d38c493c7d1f4e05c4cab78f59a2bba778fb85b1 SHA-256: bb6c74217db81fd017ecfe009eea34455dee9ab6d10ff909f7b4f835aab00c42
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. One prominent URL, https://traffnew.ru/aws?utm_term=outliers+in+statistical+data+pdf, is directly embedded and suggests a phishing or spamming attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffnew.ru/aws?utm_term=outliers+in+statistical+data+pdf
    • https://cdn-cms.f-static.net/uploads/4419637/normal_5fb41246719da.pdf
    • https://cdn-cms.f-static.net/uploads/4391008/normal_5f8ff2e8646db.pdf
    • https://maxuvejalova.weebly.com/uploads/1/3/4/2/134265339/5f4fef7a38a.pdf
    • https://xowilululevala.weebly.com/uploads/1/3/4/0/134017879/gezak.pdf
    • https://nodimawajovuri.weebly.com/uploads/1/3/4/4/134431691/7e174e3e62b9.pdf
    • https://nezumise.weebly.com/uploads/1/3/4/2/134265586/sotuwejujew-dutigu.pdf
    • https://cdn-cms.f-static.net/uploads/4369632/normal_5fab903e0e20b.pdf
    • https://cdn-cms.f-static.net/uploads/4374177/normal_5f88ddf8e6843.pdf
    • https://cdn-cms.f-static.net/uploads/4501356/normal_5fada09902b79.pdf
    • https://cdn-cms.f-static.net/uploads/4368495/normal_5f9f93219e877.pdf
    • https://xoragawamu.weebly.com/uploads/1/3/4/6/134666694/bejubij.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/cdf0b3ba-0ace-4e0d-ae53-26dbf81d5433/90867381729.pdf
    • https://s3.amazonaws.com/wiwuxot/aparatos_de_ortodoncia_infantil.pdf
    • https://uploads.strikinglycdn.com/files/6d310e08-c998-4ddb-9c2d-326299990ca5/precalc_final_exam_study_guide.pdf
    • https://s3.amazonaws.com/labitajaxatufib/the_aeneid_of_virgil_allen_mandelbaum.pdf
    • https://s3.amazonaws.com/jedaxopopuko/7505546392.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d605.bin
8d1c5d578ce36b8943d68d4b62ad2c30a5dcefe335ba2ae5a58d3de9bfcb165d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD605 4948 bytes
font_01_sfnt_off0000e6ea.bin
5bf2e7682a6be136ece565d96faab2d5de06472a50bf3e393926b3f578656dda		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EA 10472 bytes
font_02_sfnt_off00010ad4.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD4 4324 bytes

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