Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cea6508474c91b0…

MALICIOUS

PDF

80.3 KB Created: 2021-05-03 17:22:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 0c9ade4b42b8adbeddb8626351c38f50 SHA-1: 8aec443b29ad1aa3f16e8160a83cac8741d26a3b SHA-256: 0cea6508474c91b0df808ab6cde3e82ba24b4fcf9c8a9ea613550811e345be41
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, and contains a large number of external links, many hosted on disposable domains. The document body text suggests it is a lure for downloading files related to 'simple house rent receipt format pdf download', likely to trick users into downloading malware. The embedded URLs are indicative of a phishing or malware distribution campaign.

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://xezojetit.ru/strik?utm_term=simple+house+rent+receipt+format+pdf+download PDF link annotation
    • https://dewofawofuzujo.weebly.com/uploads/1/3/0/7/130775987/wexep.pdfIn PDF document text
    • https://sirukume.weebly.com/uploads/1/3/0/8/130814715/ruroj-wekumomoz.pdfIn PDF document text
    • http://hookup154.online/6388821090rvdq1.pdfIn PDF document text
    • http://vegofejolafud.mygamesonline.org/bruner_scaffolding_theory.pdfIn PDF document text
    • http://wotukujis.sportsontheweb.net/free_april_2020_calendar.pdfIn PDF document text
    • https://dujefeva.weebly.com/uploads/1/3/4/5/134589135/3ea31d70.pdfIn PDF document text
    • http://kvyovk.xyz/bupumenidutifuzokfm.pdfIn PDF document text
    • https://xogovowumo.weebly.com/uploads/1/3/0/7/130738979/9266981.pdfIn PDF document text
    • https://dorijalasenotom.weebly.com/uploads/1/3/5/3/135327318/9488758.pdfIn PDF document text
    • https://kinijanara.weebly.com/uploads/1/3/4/5/134585029/5507584.pdfIn PDF document text
    • http://nofubajabuv.medianewsonline.com/biblia_hebraica_stuttgartensia_english.pdfIn PDF document text
    • http://nanamojuvimujo.medianewsonline.com/mivuzu.pdfIn PDF document text
    • https://rabivavas.weebly.com/uploads/1/3/0/9/130969809/31ba23.pdfIn PDF document text
    • http://zoguponuwuxoli.medianewsonline.com/ielts_speaking_2020_download.pdfIn PDF document text
    • http://axecheat1.xyz/801381362880y2u.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/wukevirenesu/how_do_you_calculate_the_displacement.pdfIn PDF document text
    • http://lowuguja.myartsonline.com/biodiesel_production_from_microalgae.pdfIn PDF document text
    • https://s3.amazonaws.com/gusule/netgear_jgs524_setup.pdfIn PDF document text
    • http://dowafirowelumex.atwebpages.com/free_printable_bookmarks.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_off0000eaf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF5 5472 bytes
SHA-256: 6bc00733dca1cef50ca9fb2f2cb1c94e75fc6a3631d5e5ed2b9523f787476cc9
font_01_sfnt_off0000fd6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6C 11216 bytes
SHA-256: 946a0d613ebe54f72898f32fdf38005400c2a3385bcc3b274ecd70eb97c9acb2
font_02_sfnt_off000123cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123CD 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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