Malicious PDF — malware analysis report

Static analysis result for SHA-256 01d15885e6b84de7…

MALICIOUS

PDF

77.7 KB Created: 2021-01-01 11:52:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aa746f20908db301a2479036c5b1f5b4 SHA-1: 76618a6b156f544f5b1027629aa4803d39be7c90 SHA-256: 01d15885e6b84de7a67ebdb57a41368511e3739c145e94abe4a6dcda1fa2952d
156 Risk Score

Malware Insights

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

The file is a PDF containing numerous external links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate maliciousness. The embedded URL 'https://trafffe.ru/123?utm_term=mma+training+guide' is the most suspicious IOC, likely serving as a landing page for a phishing attack or to download further malicious content.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffe.ru/123?utm_term=mma+training+guide
    • https://cdn.sqhk.co/vutexexukus/cgjghja/zuzatibub.pdf
    • https://worozimovazez.weebly.com/uploads/1/3/1/4/131406108/3ed65.pdf
    • https://cdn.sqhk.co/siwemawatu/haiche4/dragon_ball_world_mission_gameplay.pdf
    • https://cdn-cms.f-static.net/uploads/4401691/normal_5fa4f3797ee4a.pdf
    • https://delazodudiz.weebly.com/uploads/1/3/4/5/134591817/nulifuro-lenizuso-vomidotazif-kabiba.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7a1aee42-800c-4878-ba4a-e0760d8a2fdb/47427269829.pdf
    • https://uploads.strikinglycdn.com/files/91867084-fd30-4b89-8288-e7285765fa2b/insignia_-_bluetooth_4.0_usb_adapter_driver.pdf
    • https://s3.amazonaws.com/daxemo/versus_arthritis_knee_exercises.pdf
    • https://s3.amazonaws.com/zufaxepixiguxax/come_prepararsi_al_celi_3.pdf
    • https://uploads.strikinglycdn.com/files/c1b7f754-67b8-4def-a42f-3baaae5964d9/planos_de_casas_modernas.pdf
    • https://s3.amazonaws.com/gavobawum/utorrent_webui_guide.pdf
    • https://s3.amazonaws.com/padadutiseni/xajikufodu.pdf
    • https://s3.amazonaws.com/safago/24699864810.pdf
    • https://s3.amazonaws.com/dowesitobuga/5x7_index_card_template.pdf
    • http://www.amtrak.com/servlet/ContentServer?pagename=Amtrak
    • 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_off0000f391.bin
707a15e8ebc99751dc8161060925c1a8d02b2b4d7d18a1967bc24f07b2c3e06c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF391 4940 bytes
font_01_sfnt_off0001044a.bin
c2bda50d6ec28a311f1c65f5209907599fa4362fcc15fa6953d82875dab4061f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1044A 11160 bytes