Malicious PDF — malware analysis report

Static analysis result for SHA-256 748fc1c8cdcd353e…

MALICIOUS

PDF

75.1 KB Created: 2020-12-27 07:59:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 6234d073884c62198ae5f3f01dabe827 SHA-1: 12e0aa9037b9c860149fb108827b8fb4e5c885b7 SHA-256: 748fc1c8cdcd353ed0b4eb5591161aa24aaad3859c174f7f165cab10c9d59805
254 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, indicating it is likely a phishing or malware distribution attempt. It contains numerous links to external PDFs, many of which redirect through `traffmen.ru`, suggesting a link farm or SEO poisoning tactic to distribute malicious content. The embedded URLs and the overall structure point towards an attempt to trick users into downloading further malicious payloads disguised as legitimate documents.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://traffmen.ru/aws?utm_term=matrices+objective+questions+and+answers+pdf In PDF document text
    • https://cdn.sqhk.co/tadawatimi/hbTifhh/75792828159.pdfIn PDF document text
    • https://fojivuwixi.weebly.com/uploads/1/3/4/8/134898156/rojasaravotegejolu.pdfIn PDF document text
    • https://cdn.sqhk.co/semegopo/ifjhhhe/52802785513.pdfIn PDF document text
    • https://cdn.sqhk.co/widexerun/1giFZhe/wavetabelobewiximuz.pdfIn PDF document text
    • https://keromarire.weebly.com/uploads/1/3/0/8/130873863/sejozif-fubulirere-jopekuv.pdfIn PDF document text
    • https://cdn.sqhk.co/fevivesuxofo/8jbhgji/cosmic_showdown_download.pdfIn PDF document text
    • https://cdn.sqhk.co/goluxewimabu/TRvxa2V/bujer.pdfIn PDF document text
    • https://jorosovepi.weebly.com/uploads/1/3/4/7/134706332/8137274.pdfIn PDF document text
    • https://jaxuwigoba.weebly.com/uploads/1/3/4/2/134266140/21f56645.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/kikunojulejuj/67391614745.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffc0ae25-a32e-43fa-999c-40d0de6a1fdf/32177799734.pdfIn PDF document text
    • https://s3.amazonaws.com/gujutavevive/kawifulalodi.pdfIn PDF document text
    • https://s3.amazonaws.com/dobesogum/final_fantasy_13-_2_live_trigger_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/dusined/bobizufadeliragamowag.pdfIn PDF document text
    • https://s3.amazonaws.com/remeranexe/98769829128.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_off0000e754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE754 5616 bytes
SHA-256: 3e1460ffcce50bbbce2b3be7aa31e29622c771b3eba3e3b8855a43297a2b3dde
font_01_sfnt_off0000faa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA0 10744 bytes
SHA-256: 8f1b1c35f6005dfe7518510457cb5ed8e791b737741e65b4a869a2d43f060362