Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3728e85d34b195d…

MALICIOUS

PDF

77.6 KB Created: 2020-12-19 15:58:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 5ef53fb3eeca3a6ec73ade398eedcdc9 SHA-1: 06075dc824567fdaa9bf632d4c72dca73a80889b SHA-256: c3728e85d34b195daa9174cd07654b7f6c786382fca087afd99c01f8871abdc4
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. One of the embedded URLs, 'https://trafficel.ru/aws?utm_term=the+family+man+movie++mkv', is presented as a movie download link, which is a common lure for users to click on malicious content. The PDF structure and embedded links indicate an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://trafficel.ru/aws?utm_term=the+family+man+movie++mkv PDF link annotation
    • https://fategebedabeno.weebly.com/uploads/1/3/4/7/134718848/085e8efba9fb565.pdfIn PDF document text
    • https://ponokexagetax.weebly.com/uploads/1/3/4/3/134326843/lujamadalodaba.pdfIn PDF document text
    • https://jobeluraxofedir.weebly.com/uploads/1/3/4/3/134317239/4381454.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454424/normal_5fd975be0e41b.pdfIn PDF document text
    • https://jewadasin.weebly.com/uploads/1/3/4/6/134604584/felalizaronovuwenuz.pdfIn PDF document text
    • https://xedowekogo.weebly.com/uploads/1/3/4/6/134609622/f30eb.pdfIn PDF document text
    • https://vesalitekaso.weebly.com/uploads/1/3/4/3/134314643/4409393.pdfIn PDF document text
    • https://xisuviwilizej.weebly.com/uploads/1/3/4/3/134320176/cb77207984fbb4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381762/normal_5fd0fe481f3ac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413714/normal_5fdddebf00804.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fumiposamisur/indian_human_development_report_2019.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6489b16f6d44b07e34629/t/5fcf7e4024ae147ef3dfd369/1607433793284/18731391691.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_off0000f460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF460 4908 bytes
SHA-256: 22b2e5b2e3c91414d0027d5002491e93c0a0946c3728c1d6d3864bb235cc8d3d
font_01_sfnt_off000104fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FE 10792 bytes
SHA-256: 89a86952716a6bf362d5ae00aef57c40c98dc7e684421ba5cb9bd9f1fb03875b

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