Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e82c7210a697bc4…

MALICIOUS

PDF

63.1 KB Created: 2021-01-20 15:08:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 83e910eeb51a5230eb6c7fb45b410ad8 SHA-1: 840aba87900e947fba8117e1865cff40afc17699 SHA-256: 9e82c7210a697bc414d342dea31f511a756c4f8cdf5491b1de35f23b0aa36832
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a significant number of embedded links, with one heuristic specifically identifying it as a link farm pointing to potentially malicious redirector infrastructure. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were directly extracted, the presence of numerous external links suggests an attempt to lure users to external malicious sites, likely for phishing or malware delivery.

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
  • 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.
  • 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.
  • 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://cctraff.ru/123?utm_term=blackhawk+middle+school+eagan In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370051/normal_5fa9d5211db58.pdfIn PDF document text
    • https://nonejekorozu.weebly.com/uploads/1/3/4/1/134108542/1620041.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412908/normal_5faf3116d8919.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375095/normal_5feb716bca9aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393502/normal_5fa8fc7c77764.pdfIn PDF document text
    • https://site-1166752.mozfiles.com/files/1166752/world_war_2_magazine_subscription.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457320/normal_5fed10d8d5a04.pdfIn PDF document text
    • https://cdn.sqhk.co/fulaxanew/iihbn89/mi_launcher_pro_apk_cracked_download.pdfIn PDF document text
    • https://site-1174092.mozfiles.com/files/1174092/senimigifitixazarud.pdfIn PDF document text
    • https://zemijawa.weebly.com/uploads/1/3/1/0/131070152/63c42cd53.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383912/normal_6006898aed741.pdfIn PDF document text
    • https://vonepegoparopew.weebly.com/uploads/1/3/4/3/134352316/jubiku-mulurifomotaki-sumoj-tewapanid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417033/normal_5fa000e1e89a5.pdfIn PDF document text
    • https://site-1168501.mozfiles.com/files/1168501/butavusewenadovil.pdfIn PDF document text
    • https://cdn.sqhk.co/tivaboloxome/YhfigRh/50790131060.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/megulu/97502881463.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_off0000b7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7FB 5464 bytes
SHA-256: 60e4a8978cc27f435d0111c31633172e66413a3e8a3cf4b057e03ad15e72ca7f
font_01_sfnt_off0000ca80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA80 10580 bytes
SHA-256: 1d15e52996fb04e8a9087a3ec86d7904e31876ff355ad881a252cfee2c92c44c

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