Malicious PDF — malware analysis report

Static analysis result for SHA-256 8841ed27a0806f43…

MALICIOUS

PDF

62.3 KB Created: 2020-11-22 18:40:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 078c4a746171a6c2184fb52c95cf71b2 SHA-1: 18dc147fa775304c99da0206abd18bda116ebeec SHA-256: 8841ed27a0806f43dc52cac721b808c49c9542d4b61aa79aa7f63ff94a9c024f
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier. It contains a large number of external links, many pointing to PDF files, suggesting a link farm or redirection mechanism. The primary external URI, 'https://traffset.ru/aws?utm_term=manual+for+bradford+white+water+heater', indicates a potential lure to a website that may host malicious content or phishing pages. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffset.ru/aws?utm_term=manual+for+bradford+white+water+heater
    • https://cdn-cms.f-static.net/uploads/4417536/normal_5f960036e81ab.pdf
    • https://novafonofijufi.weebly.com/uploads/1/3/4/4/134480525/kalib_dadilake.pdf
    • https://sibafuguwo.weebly.com/uploads/1/3/4/6/134679660/1921225.pdf
    • https://cdn-cms.f-static.net/uploads/4488807/normal_5fab51863d111.pdf
    • https://cdn-cms.f-static.net/uploads/4376354/normal_5f8b3e5f7fc5e.pdf
    • https://cdn-cms.f-static.net/uploads/4393029/normal_5fafecc85e214.pdf
    • https://cdn-cms.f-static.net/uploads/4371023/normal_5fa975506bb13.pdf
    • https://cdn-cms.f-static.net/uploads/4369802/normal_5f99e18c6f788.pdf
    • https://vevinobe.weebly.com/uploads/1/3/4/4/134487659/812a898aaa.pdf
    • https://cdn-cms.f-static.net/uploads/4367960/normal_5f8ac5ce71fa6.pdf
    • https://cdn-cms.f-static.net/uploads/4406516/normal_5f9d8cd61328e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/19a0b6f0-fcb0-4815-8c3a-fd0af5e5b9ff/miraxivavodiwij.pdf
    • https://uploads.strikinglycdn.com/files/0f73d142-c208-476c-89bf-f62ef94eeafb/jafevujotalekulel.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_off0000b8ee.bin
cc2d1efbff1b675745de6b2b1aa804ea21a958c7112a188aa15b037b48ae2a2f
pdf-font-stream PDF embedded font (sfnt) at offset 0xB8EE 5056 bytes
font_01_sfnt_off0000ca35.bin
913bb55a0c2cda90effdb5ebe7250f69c2f38e4294024060241de55782f8bdd0
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA35 10024 bytes