Malicious PDF — malware analysis report

Static analysis result for SHA-256 87e2b5cb4398fafb…

MALICIOUS

PDF

71.8 KB Created: 2020-12-28 20:44:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6bc1929307147c0e4b26da8f1790d5d7 SHA-1: 7e5cd4f201fe109f061372da6d4b9a27c3e9ac46 SHA-256: 87e2b5cb4398fafbb89ee72c1a2aa9cf60542a0e5bbfd55617c4e61fd7fabe09
156 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a link farm and an embedded URL pointing to 'traffnew.ru', suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of common phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=allergy+action+plan+form+for+school
    • https://cdn.sqhk.co/rogotojuseb/hh0K1Gi/85679219681.pdf
    • https://wujawosekeg.weebly.com/uploads/1/3/4/7/134712458/bdd96ba4ba11dff.pdf
    • https://moxitimufetumo.weebly.com/uploads/1/3/4/0/134040580/1606601.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/501f61f6-192c-4c49-acd0-9fd077278182/linawebumaturatobulere.pdf
    • https://s3.amazonaws.com/leteraxewe/lcd_tv_repair_guide.pdf
    • https://s3.amazonaws.com/jinabom/american_history_a_survey_11th_edition_notes.pdf
    • https://uploads.strikinglycdn.com/files/ea31d2ab-2d06-4e48-bc1f-b4a42a67183f/gumegijobujuramu.pdf
    • https://uploads.strikinglycdn.com/files/074da5ba-343b-4714-9a92-6d2c289c3704/42497734859.pdf
    • https://uploads.strikinglycdn.com/files/d346b1fd-3091-4f13-8b46-dd125e729656/30030028065.pdf
    • https://s3.amazonaws.com/tofizo/popular_platformer_games_ps3.pdf
    • https://s3.amazonaws.com/vavapekadoliti/65472186090.pdf
    • https://uploads.strikinglycdn.com/files/d527cebf-f703-4f47-b5f9-601d94281fb9/free_mp3_download_for_iphone_4am_melanie_fiona.pdf
    • https://s3.amazonaws.com/norozovijalu/22653406846.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d809.bin
969c2377cd300527bbdb575816e2e839cf680bbddf30fec688c9b25bd33e09a2
pdf-font-stream PDF embedded font (sfnt) at offset 0xD809 5520 bytes
font_01_sfnt_off0000eab5.bin
86e11be0235a5d6d07f31ef529673592cb7c06cf7404801314a4ac68825c045a
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB5 11232 bytes