Malicious PDF — malware analysis report

Static analysis result for SHA-256 96df97fbbb664ddb…

MALICIOUS

PDF

64.8 KB Created: 2020-11-26 03:33:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: ea29a3be30c4f3925a6f580e0d578bf9 SHA-1: ec66cb6f7fa01fad483e19ade28f14c8e853abf4 SHA-256: 96df97fbbb664ddb8c6faaeb55894d18c0aa80bbbc52f3da79b6e1eae01ab96c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting services, indicating a link farm or phishing attempt. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffe.ru/strik?utm_term=ucla+building+map PDF link annotation
    • https://vejuvofarazaxar.weebly.com/uploads/1/3/4/3/134355137/2607014.pdfIn PDF document text
    • https://nonegisetuku.weebly.com/uploads/1/3/4/8/134877303/ludewefufuvi.pdfIn PDF document text
    • https://naxedomabaxa.weebly.com/uploads/1/3/1/6/131606472/xutun.pdfIn PDF document text
    • https://munerotilaxamo.weebly.com/uploads/1/3/4/4/134476206/5419771.pdfIn PDF document text
    • https://vewawuwidavejo.weebly.com/uploads/1/3/4/4/134403009/8153709.pdfIn PDF document text
    • https://zosibikatojufo.weebly.com/uploads/1/3/4/3/134382834/13f7c899dc28b.pdfIn PDF document text
    • https://sosufafa.weebly.com/uploads/1/3/4/8/134862430/9e337.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/da8d6d50-1443-4990-9475-c21986b40fab/veduve.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd2929bb-57f7-4907-bb0e-853c0eca9b87/a-_train_9_v5._0.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c446eee-5cba-43b9-b37d-ddd121c0e31b/98122476540.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e55fa249-e7ff-4923-a63e-81c4a466f027/shane_sweet_arrested.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de34a8e3-0338-47fd-9eef-818f077ee1dd/woronafapekefa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0e643ae-3ff6-45e9-bda1-8f1ae17dba0b/genul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e52cd6a-1630-4d6d-9904-7ac5b54e471d/walmart_community_grant_application.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_off0000c17d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC17D 5252 bytes
SHA-256: 1cc07f90c46f30c188b5b88215bdab22ebebbecfd71b2434d463f617d277ece7
font_01_sfnt_off0000d349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD349 10504 bytes
SHA-256: 3a750bea2758aabd62e1ad1c5302ed7737f6199dd9cd1756aaea1517befaedd2

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