Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa87b0ebba7bb1ed…

MALICIOUS

PDF

77.2 KB Created: 2021-03-04 01:19:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a2ba5cd345b59714f90c463e39ace574 SHA-1: 20f6390c6244b70fa7e26899e1af38de18ade3de SHA-256: fa87b0ebba7bb1ed1c822eb3a9feb609ce8f34ae53e83ace7d7f896f72169c97
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam campaign. The document body, though heavily obfuscated, appears to be related to search queries, further supporting the lure-based attack pattern.

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
  • 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://midufefew.ru/strik?utm_term=what+do+the+colors+of+rosary+beads+mean PDF link annotation
    • http://giwapozolaleg.mypressonline.com/taylor_swift_fearless_album_download_mp3.pdfIn PDF document text
    • http://kidufamipowanot.mywebcommunity.org/free_subject_and_predicate_worksheets_for_3rd_grade.pdfIn PDF document text
    • https://xofofafe.weebly.com/uploads/1/3/1/4/131438501/8d945ef8416a6.pdfIn PDF document text
    • https://xegejigavo.weebly.com/uploads/1/3/4/8/134883842/sidemar.pdfIn PDF document text
    • https://furiraduwonejos.weebly.com/uploads/1/3/4/8/134870793/d69a7c325b6.pdfIn PDF document text
    • https://sinegozedajosor.weebly.com/uploads/1/3/1/8/131871849/f27d3a.pdfIn PDF document text
    • https://doxazefeseremef.weebly.com/uploads/1/3/4/7/134764644/5946666.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413363/normal_5fc5aa7a8eed6.pdfIn PDF document text
    • https://dopakujovifoba.weebly.com/uploads/1/3/0/7/130739833/5018909.pdfIn PDF document text
    • https://jekomijijupuda.weebly.com/uploads/1/3/1/4/131438685/8241846.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482636/normal_6014dc71d8f21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484995/normal_60148f13922bb.pdfIn PDF document text
    • https://vusesuke.weebly.com/uploads/1/3/4/7/134723580/joxofamab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411916/normal_5fcb4fde1befb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lujuxepaxizi.rf.gd/wunamozekatarifo.pdfIn PDF document text
    • http://bogurivesinoni.rf.gd/13494135975.pdfIn PDF document text
    • http://fosixokosed.rf.gd/wildgame_trail_camera_lock_box.pdfIn PDF document text
    • http://mubaviz.epizy.com/aprender_a_leer_y_escribir_coreano.pdfIn PDF document text
    • http://ketabigumowun.atwebpages.com/catholic_childrens_bible_stories.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_off0000eff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF1 5516 bytes
SHA-256: 3c77d656bd93370578c82fc040519dac8f6d00b769fca4755ad9c752fa16da86
font_01_sfnt_off0001029a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029A 10660 bytes
SHA-256: ce1215add069f742b8dc181888f4b893145125e1d8b26e95a094450bd1726155

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