Malicious PDF — malware analysis report

Static analysis result for SHA-256 89640e902cbe331c…

MALICIOUS

PDF

76.0 KB Created: 2021-01-17 06:02:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: ebf8ab185825b9ef965154a2a317cde3 SHA-1: 774a36b31da560fb37bf13eb59c4b12edd11ad4c SHA-256: 89640e902cbe331c3ef0ff7825ecdb83c848df2824d4a50761e79f6f688aba88
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The document contains a large number of embedded URLs, many of which point to disposable hosting or are part of a link farm, suggesting an attempt to manipulate search engine results or lure users to malicious sites. The ML classifier and ClamAV also strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ggtraff.ru/123?utm_term=nikon+fe2+manual+pdf In PDF document text
    • https://vadutebo.weebly.com/uploads/1/3/4/8/134889136/6796954.pdfIn PDF document text
    • https://cdn.sqhk.co/rogokivika/ha62m7b/war_of_the_worlds_1953_dvd_cover.pdfIn PDF document text
    • https://site-1168056.mozfiles.com/files/1168056/rock_talk_messenger_chat_download.pdfIn PDF document text
    • https://jezonekapinojel.weebly.com/uploads/1/3/4/6/134619201/e20644d.pdfIn PDF document text
    • https://cdn.sqhk.co/kawonidoza/tkjhd0n/scary_sounds_creepy_sound_effects_download.pdfIn PDF document text
    • https://cdn.sqhk.co/purorelaz/mgdicgg/top_pop_music_clean_2019.pdfIn PDF document text
    • https://fumumakol.weebly.com/uploads/1/3/4/0/134017799/2667328.pdfIn PDF document text
    • https://gudimutukadido.weebly.com/uploads/1/3/4/6/134648046/4230246.pdfIn PDF document text
    • https://cdn.sqhk.co/xewumoxu/dZiiaje/rowatilof.pdfIn PDF document text
    • https://cdn.sqhk.co/finelega/4BiioUM/easypay_metrocard_account_number.pdfIn PDF document text
    • https://fitisasituwag.weebly.com/uploads/1/3/4/8/134846324/xasoxemitog-mozojiloxugaru-vigijikonepeb.pdfIn PDF document text
    • https://fuxarudoniw.weebly.com/uploads/1/3/5/3/135350341/rukexagitudil-mokejewot.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/tikofaketonub/jimarijekelagotefin.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_off0000e204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE204 2960 bytes
SHA-256: 3c6502e04658d985b37ed967139d4b1bb7136c1c8ff06868e6b64c17630b7d50
font_01_sfnt_off0000ec87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC87 5080 bytes
SHA-256: 595c577b844c08dd6d4cef4de06459d1fce0c240dad6b8b1aed992a408dc8292
font_02_sfnt_off0000fdd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD0 10872 bytes
SHA-256: 7a2dc8fc1187646875480137aec833e2012a973bc6610b23bfb55da8f7b987fe

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