Malicious PDF — malware analysis report

Static analysis result for SHA-256 56b5e18d7777fe73…

MALICIOUS

PDF

74.7 KB Created: 2021-03-30 11:06:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: d3871df483394ffdfb2f8d10ccbba699 SHA-1: da35375e2c3770bb37d77787e029ef7813779068 SHA-256: 56b5e18d7777fe733767debff3f80c3409874df6ef4211114cffcc58cb457627
186 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and contains a significant number of external links, many pointing to disposable hosting. One of the primary URLs extracted is https://mezovuduw.ru/strik, which is likely part of a link farm or phishing campaign. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to lead users to external, potentially malicious, content.

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://mezovuduw.ru/strik?utm_term=letra+de+cancion+catolica+jesus+amigo PDF link annotation
    • https://migawonakizize.weebly.com/uploads/1/3/1/6/131637147/3a4ae67c.pdfIn PDF document text
    • https://bazojarazete.weebly.com/uploads/1/3/4/6/134650598/lipezufetosupi.pdfIn PDF document text
    • https://ramakizuwag.weebly.com/uploads/1/3/4/3/134321509/nosasojejunuf-danugusa.pdfIn PDF document text
    • https://cdn.sqhk.co/wujozuzewed/hbHihgi/vampire_diairies_netflix_france.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372963/normal_60624dda3fb07.pdfIn PDF document text
    • https://cdn.sqhk.co/kedezoge/jgdTK9y/virtual_slime_free_play.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447280/normal_6035bc8211c25.pdfIn PDF document text
    • https://wadaletabuj.weebly.com/uploads/1/3/2/6/132695896/tabutevojumi-gaviwemikis-dibir-dupigubixum.pdfIn PDF document text
    • https://cdn.sqhk.co/rovifatira/hhdhijb/60198204956.pdfIn PDF document text
    • https://cdn.sqhk.co/bitizulokiva/dCgdhgc/17518998304.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://37b1cabf-41b6-4e27-befa-0fe7335ed416.filesusr.com/ugd/9d05b5_f239ed0b9e4e48398d2b02eec6ddf5ad.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9631cf17-f091-41e3-b7bd-8c99473dabca/paresowaduvoxagofomot.pdfIn PDF document text
    • https://128fc002-9ed4-4a8f-9a6b-83b43563a9ed.filesusr.com/ugd/6812d7_1c5acf1cd8da42278cb5d4d3fe4fbd0a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a3fc9a5-4510-48fa-acbe-d8cc101ebe4c/nagekumagovakowugojet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e252398-ec4f-4bef-b395-01d4e017c75e/mr._coffee_one-touch_coffeehouse_espresso_maker_and_cappuccino_machine_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/zuses/annual_free_credit_report_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfdaeec9-f469-44e2-bb88-ab91d978577a/4461188723.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54e1f0ed-48bd-4a37-8928-9d7cb1c2aba5/where_to_take_seashells_links_awakening.pdfIn PDF document text
    • https://569961a5-e6b5-462d-8b38-7193d5e7b20b.filesusr.com/ugd/a37a2e_221ec60880624488b375c40ed24a9490.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zerejibixupav/anestesia_local_odontolgica_y_lactancia.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_off0000e233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE233 5276 bytes
SHA-256: 522c4854ebd6dd34b460bbccdde821ae96f15db29e2a85f384678829d903fc2b
font_01_sfnt_off0000f414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF414 12256 bytes
SHA-256: 1111d5786f595113890e705f205f44d8597edf3e2a18935efacf358e5ad1eaf0