Malicious PDF — malware analysis report

Static analysis result for SHA-256 28a7f137886f562a…

MALICIOUS

PDF

75.7 KB Created: 2021-03-23 18:44:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: c70cdd10dd7e3e3e3a3a205e289d918b SHA-1: 402df19e68aa4f1effbd77a97671c869bdaff741 SHA-256: 28a7f137886f562a6db2e26de63cf6bc5934272dc6994dc35fb2c0b03afdd014
186 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 critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The document body, though truncated and obfuscated, contains keywords related to 'free children's bible stories powerpoint' and is generated by wkhtmltopdf, indicating a potential lure to disguise 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://seumenha.ru/strik?utm_term=free+children%2527s+bible+stories+powerpoint PDF link annotation
    • https://cdn.sqhk.co/nopawuwam/QhifEfM/dark_side_of_the_moon_logo_meaning.pdfIn PDF document text
    • http://viwesisikumebi.getenjoyment.net/45917015630.pdfIn PDF document text
    • https://donabetolemi.weebly.com/uploads/1/3/1/6/131637402/6051367.pdfIn PDF document text
    • https://cdn.sqhk.co/disegivoji/jbBXhao/defender_car_old.pdfIn PDF document text
    • https://cdn.sqhk.co/nakijalufiw/jDigjgG/game_army_toys_town_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/wofikubid/gjU1hbd/star_wars_galaxy_of_heroes_beginner_guide_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/pugepavofu/Zjix0je/notonisewodosumadidi.pdfIn PDF document text
    • https://cdn.sqhk.co/lexuxeza/ja2jhjd/borrowed_angel_sheet_music.pdfIn PDF document text
    • https://disaximineta.weebly.com/uploads/1/3/4/8/134883765/suvufitarugidalowumi.pdfIn PDF document text
    • http://gosoxegekiri.mywebcommunity.org/democracy_and_civic_education.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0931b693-57ee-4251-810b-4dc6bf4eb9e4/can_you_make_a_living_day_trading_options.pdfIn PDF document text
    • http://gerosopidazab.rf.gd/kufebudipibotisitulata.pdfIn PDF document text
    • http://gatopaxabijux.epizy.com/43213282512.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34c90579-9c6b-4a46-a8f0-0c2a5574e281/josomezupedogekodowexukod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b34752ba-f4ee-48b1-964f-c5bbf319437e/zanifiro.pdfIn PDF document text
    • http://fepenupusabumo.rf.gd/timovizawop.pdfIn PDF document text
    • http://vejidot.epizy.com/romarew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8484f0e4-9abd-4016-9c48-3c7353e70558/how_to_use_a_hair_dye_cap.pdfIn PDF document text
    • http://ziladujaxizi.rf.gd/tusikub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56916284-4975-4d2a-9c34-b87b3c1f33e4/61148661457.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_off0000ea64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA64 5172 bytes
SHA-256: c94ad8d4e6a18d85020e4eaaf7c7307b263e2418e546d71c1c6930ff433058af
font_01_sfnt_off0000fc09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC09 10560 bytes
SHA-256: 37f5c66209f987d0049fef1fc051551a9dbd8785f9e3363be7eddc190c81c881

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