Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ca3c1ad869d8376…

MALICIOUS

PDF

68.4 KB Created: 2021-01-18 04:36:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 61b081d3b3a513fb46e1252f1366af0d SHA-1: 9bca29a70bdb12f9afaa150c4526f006082cd766 SHA-256: 9ca3c1ad869d83760b98ee4ec127e4bdb36e50dddb1cae2ecbe23aae8a1d397f
244 Risk Score

Malware Insights

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

This PDF document functions as a link farm, embedding numerous URLs that redirect to potentially malicious content. The document's body text, though partially corrupted, suggests a lure related to "Chevy repair manual pdf" to entice users to click on these links. The presence of a known malicious redirector URL and the sheer volume of links hosted on disposable domains indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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=chevy+repair+manual+pdf In PDF document text
    • https://nigikejogu.weebly.com/uploads/1/3/4/9/134902550/92c2318731.pdfIn PDF document text
    • https://vukasusig.weebly.com/uploads/1/3/4/3/134349680/1218409.pdfIn PDF document text
    • https://vavetoros.weebly.com/uploads/1/3/4/8/134854671/rulox.pdfIn PDF document text
    • https://cdn.sqhk.co/sizozizaj/hhdgeii/xusiresopujoxexaja.pdfIn PDF document text
    • https://cdn.sqhk.co/wifavizen/IszPjdg/79457380379.pdfIn PDF document text
    • https://site-1177224.mozfiles.com/files/1177224/55302713701.pdfIn PDF document text
    • https://site-1178057.mozfiles.com/files/1178057/26293484997.pdfIn PDF document text
    • https://site-1172235.mozfiles.com/files/1172235/ice_cream_truck_rental_freehold_nj.pdfIn PDF document text
    • https://zevebijupaxize.weebly.com/uploads/1/3/4/7/134754497/ganajifuk.pdfIn PDF document text
    • https://site-1173562.mozfiles.com/files/1173562/basketball_buzzer_sound_mp3.pdfIn PDF document text
    • https://polabufasol.weebly.com/uploads/1/3/2/8/132814050/147a10232f42.pdfIn PDF document text
    • https://mofumamivuzav.weebly.com/uploads/1/3/1/0/131070192/c51a81.pdfIn PDF document text
    • https://malekijewa.weebly.com/uploads/1/3/0/8/130813883/fufone.pdfIn PDF document text
    • https://cdn.sqhk.co/tefozakozup/BYvlZgj/robudisuzovowiv.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/welanisowari/dj_lyta_dancehall_video_mix.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_off0000d066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD066 5168 bytes
SHA-256: b4689ebcf3a75b6092960041235952335fb6ffd414b57cb2ee76888065afb88b
font_01_sfnt_off0000e1dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DC 10140 bytes
SHA-256: e24fc5b1e00e0bc1c059ee856f5afd80d99372f1e9d7e99c3918ba22224f7bb1

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