Malicious PDF — malware analysis report

Static analysis result for SHA-256 87cedbca8adc7951…

MALICIOUS

PDF

64.2 KB Created: 2020-12-15 07:54:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 02b2792e7733c0bfafc1398d282f8bb1 SHA-1: 19e4caf02d01a4745a7cae0d87c208bf4dc2ccea SHA-256: 87cedbca8adc7951ce55e883e9ef2e5d116232afb5d474f473d85d01c52985b2
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' indicating a large number of outbound links. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded URL 'https://trafffe.ru/123?utm_term=wind+of+change+chord+and+lyrics' appears to be the primary lure, disguised as a search result for song lyrics.

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://trafffe.ru/123?utm_term=wind+of+change+chord+and+lyrics PDF link annotation
    • https://keziripar.weebly.com/uploads/1/3/4/5/134522929/tiwowad.pdfIn PDF document text
    • https://zabapekiji.weebly.com/uploads/1/3/4/4/134470890/wogetubaxovogofo.pdfIn PDF document text
    • https://kabijefilomi.weebly.com/uploads/1/3/4/7/134761935/3409034.pdfIn PDF document text
    • https://rajaxamakato.weebly.com/uploads/1/3/2/3/132302926/bfbc7bb65d1c2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc5709f2bbd740658251595/t/5fd6bc06481cfa31add58c1c/1607908359221/torosiposigalu.pdfIn PDF document text
    • https://s3.amazonaws.com/befarekogol/71820986325.pdfIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/fanewosoxivuzonimageginav.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc575d0b8467722f1f2951c/t/5fc7974a7995075abde92dfe/1606915914507/crusaders_quest_mod_apk_4._19._20.pdfIn PDF document text
    • https://s3.amazonaws.com/fixararololu/arterial_ulcer_treatment_guidelines.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e80068612547ed5e2b99/t/5fc22aca3c02f22b9d55f841/1606560460055/67841430738.pdfIn PDF document text
    • https://s3.amazonaws.com/zebarufuridorur/can_we_video_from_linkedin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef578594-09fe-43ef-a345-71be59c363ff/peculiar_institution.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc58510d49dd12447539740/t/5fce85d68c2c4f63a99780ef/1607370199548/vusetidixijobivop.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc78a98bcf5f06bcb796135/t/5fcab4c65113a7255f77db5a/1607120071163/car_driving_games_apk_mod.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_off0000bc0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC0A 5400 bytes
SHA-256: 3452237e77f69b38f48d8bbfb7f777e3e6dabd4e3318469d0be872e877ccc17c
font_01_sfnt_off0000ce78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE78 11176 bytes
SHA-256: 4c5c4d3ba3b2a101777bf5582418c905cf66ab6ac7a4b653ab606d869268c9e5

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