Malicious PDF — malware analysis report

Static analysis result for SHA-256 77246bb81bebda0d…

MALICIOUS

PDF

89.4 KB Created: 2020-11-26 07:06:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 1a5c250f97b3083cef270b6aadf8379a SHA-1: d5619fcf10a9f44c1e2715d29929838d7e0b209b SHA-256: 77246bb81bebda0d2d5206957ac7b6b328a6866c9fe7899e5bfd18e7801d941f
214 Risk Score

Malware Insights

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

This PDF file exhibits malicious behavior by hosting a large number of external links, many of which point to potentially malicious redirectors or SEO link farms. The embedded URLs suggest an attempt to drive traffic to malicious infrastructure, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffking.ru/strik?utm_term=lithospheric+plates+questions+answer+key In PDF document text
    • https://vakesefujes.weebly.com/uploads/1/3/0/7/130739027/67dbe87bd75273e.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/3718456.pdfIn PDF document text
    • https://mukiniga.weebly.com/uploads/1/3/4/3/134318698/mabegofuxetokod_kabonulakuge.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472479/normal_5fad81f5b87de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379846/normal_5f8c2b6c5e8ca.pdfIn PDF document text
    • https://sugiravo.weebly.com/uploads/1/3/4/4/134455537/mekolajeruzuz-zifurimi-kexudona.pdfIn PDF document text
    • https://vilukenuxe.weebly.com/uploads/1/3/2/8/132814007/8c1ce2929f2f.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/f402ba9e-6507-4ebe-a599-54de82ce99d0/rotoxado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffe3af04-6a32-42e5-a4eb-fa10a152497c/93048663318.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf109874-aa8b-43d3-90f4-d0460a44a1f6/rikozowogajes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86d32ad3-74e6-4771-bdc6-f8a104eb6db0/61288209439.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28cff572-19a8-485b-bd98-bff42391bc1f/simone_browne_dark_matters.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10478 7932 bytes
SHA-256: b0a66361eaf5b629e800fbd092e15f5c9480e769c17f1c6e1daa60e13f8aa872
font_01_sfnt_off00011e74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E74 5344 bytes
SHA-256: 7a830512c23002037a65271fc4b71e874817a633c530631c5d3abdb11cd66499
font_02_sfnt_off000130bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130BC 11588 bytes
SHA-256: 8fddb78c479e40c9459e0385330b6cdda4fc997b7e984adaee1438e746d120cc

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