Malicious PDF — malware analysis report

Static analysis result for SHA-256 ece6910a60e70651…

MALICIOUS

PDF

71.3 KB Created: 2021-02-27 18:07:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 09e8c9331633f2f9bd1a3466f24fc982 SHA-1: 409b2ac04ab40eb19325ba3e0d34e379fc1d4d5c SHA-256: ece6910a60e7065148a2bcf5099afde9937b57fc6cb4b13d2d85636c0bd38ae9
244 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a redirector link and a link farm on disposable hosting. The embedded URLs, such as 'https://dafemum.ru/123?utm_term=pizzeria+due+hours', likely lead to phishing or malware distribution sites. The presence of numerous links to external PDFs suggests an attempt to manipulate search engine results or direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dafemum.ru/123?utm_term=pizzeria+due+hours In PDF document text
    • https://wivoximuvekobug.weebly.com/uploads/1/3/4/4/134473281/8776629.pdfIn PDF document text
    • https://geridaradekod.weebly.com/uploads/1/3/1/4/131437552/xisajatugujifud.pdfIn PDF document text
    • https://resevaguwitim.weebly.com/uploads/1/3/5/2/135298688/mexigumumeziv.pdfIn PDF document text
    • https://cdn.sqhk.co/livukigelo/iahgfSM/10816325235.pdfIn PDF document text
    • https://zuveravovizopow.weebly.com/uploads/1/3/0/9/130969477/bobofikeja.pdfIn PDF document text
    • https://cdn.sqhk.co/jopubelo/O6ibpiQ/rolling_sky_download_google_play.pdfIn PDF document text
    • https://cdn.sqhk.co/naziwixolagu/sfijkgh/4515190597.pdfIn PDF document text
    • https://cdn.sqhk.co/dovoxukeni/gi6HhhW/anti_theft_alarm_for_home.pdfIn PDF document text
    • https://cdn.sqhk.co/giwitosak/feHjbhc/swot_meeting_ideas.pdfIn PDF document text
    • https://riwinimogo.weebly.com/uploads/1/3/0/9/130969841/0ab5dd5b23a.pdfIn PDF document text
    • https://bujefodamefizup.weebly.com/uploads/1/3/1/0/131070612/roligokufojewobeb.pdfIn PDF document text
    • https://cdn.sqhk.co/zupuguvawaj/TPmEr5F/suvuxesiwabi.pdfIn PDF document text
    • https://cdn.sqhk.co/wibetaxor/a5jb8wt/mind_blowing_games_to_play_with_friends.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/gomaxod/carry_in_jatta_2.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_off0000dc12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC12 4932 bytes
SHA-256: 1a1c8253542755887003f74f0d0144dc2c5c08a80825ae52c3d1fa7b1540b883
font_01_sfnt_off0000ecd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD4 10492 bytes
SHA-256: 8b606dda3fb09b5569a85b67d14b087f33bd362994511a81de4f32341394c7cd

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