Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc9fc78382f87950…

MALICIOUS

PDF

108.9 KB Created: 2020-11-11 14:42:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: ea546df7c85af7699ca24394a5cceebe SHA-1: 342ebfb438a7d0e5c9b64285bda7613f4747a4fb SHA-256: bc9fc78382f87950545c59f7f8ccd596aebdb87a9fe5d3c23eefa31f04dc8587
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirectors or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO abuse. No scripts were extracted, but the embedded links are the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffine.ru/aws?utm_term=refinance+mortgage+rates+chase In PDF document text
    • https://babikovinemixe.weebly.com/uploads/1/3/1/8/131856339/weveli.pdfIn PDF document text
    • https://forovaze.weebly.com/uploads/1/3/4/3/134315943/597637.pdfIn PDF document text
    • https://zuparimetusu.weebly.com/uploads/1/3/1/3/131378993/5555687.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/4041939.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/tetazino/articles_a_an_the_grammar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f087b39-170b-4802-bbe6-c6b14689cb32/vuviminudifewawusokinuso.pdfIn PDF document text
    • https://s3.amazonaws.com/wukara/nizumaxuxanikuxojusu.pdfIn PDF document text
    • https://s3.amazonaws.com/bodepova/fusosiwuzatesoda.pdfIn PDF document text
    • https://s3.amazonaws.com/panokojol/lisozepexu.pdfIn PDF document text
    • https://s3.amazonaws.com/wofaxil/the_three_stooges_spooks_cast.pdfIn PDF document text
    • https://s3.amazonaws.com/napoledunadigo/96715320853.pdfIn PDF document text
    • https://s3.amazonaws.com/degagaziv/mansfield_middle_school_staff.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/family_don_t_end_with_blood.pdfIn PDF document text
    • https://s3.amazonaws.com/xarojapi/22997967137.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fda5886a-59bb-4994-9bb2-d5690266bdc4/71808176250.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_off000162b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162B0 5060 bytes
SHA-256: c941bdefafbe4204ad35ae7680a775505a9e447259bdc9025f84896e517909e7
font_01_sfnt_off000173b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173B4 10680 bytes
SHA-256: 002d5facd645b5194452ec185abc7d437e9ed7b26fe85dd4dc3dba70d5b01b1e
font_02_sfnt_off0001983f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1983F 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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