Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed4a873f18a2ccf6…

MALICIOUS

PDF

63.9 KB Created: 2020-11-24 07:14:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b1a0b8c075710f3d31d1ded3ed0094e3 SHA-1: 144371b78ad031a1ee334d2905734e3c4efe7842 SHA-256: ed4a873f18a2ccf6f13ef736d8c4b9b72611c3b1af9cb752518c9a5de5462efc
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of a malicious document, possibly leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • 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://trafffe.ru/strik?utm_term=farmall+h+manual+download
    • https://nagilozumovamag.weebly.com/uploads/1/3/4/3/134317868/masab.pdf
    • https://tugajepefur.weebly.com/uploads/1/3/1/4/131453805/dc40370d2f.pdf
    • https://cdn-cms.f-static.net/uploads/4383692/normal_5f8d44fd0f717.pdf
    • https://nezemugobif.weebly.com/uploads/1/3/4/5/134519414/zaxito.pdf
    • https://sidugavumudoriz.weebly.com/uploads/1/3/4/9/134902227/zebuveritilowitugope.pdf
    • https://savakorudefipe.weebly.com/uploads/1/3/2/3/132303238/313ec98f2ef.pdf
    • https://cdn-cms.f-static.net/uploads/4421637/normal_5f9dafc3a5eac.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0a34ee62-eb77-47a2-8137-4d06ac8d19b6/jijodexirupajojulerebuwu.pdf
    • https://uploads.strikinglycdn.com/files/9a284822-690a-48fa-8cbd-512f935f541c/bigonivodejumoxuvawage.pdf
    • https://s3.amazonaws.com/wajufifenoxuj/26615095718.pdf
    • https://s3.amazonaws.com/wilugugo/37950888328.pdf
    • https://uploads.strikinglycdn.com/files/e4f159b1-4854-4596-9bf8-b4ac2425c76c/suwatodarud.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_off0000be5a.bin
13f372ef72bd6f02f9cf58dea603db58584a5df6700904fb4025f03efa443379		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBE5A 4932 bytes
font_01_sfnt_off0000cf03.bin
b89189eca6db784c5f294ef15b4979431819201d521e7c036665c6f1602c5114		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF03 10588 bytes

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