Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e7119b3e4d6f3f5…

MALICIOUS

PDF

76.5 KB Created: 2021-03-19 08:13:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 44fe46eabfe4036161500fa617770f3b SHA-1: a361ab0439595dc1be687c5c1a1995deef02a140 SHA-256: 2e7119b3e4d6f3f578d1f4c6f9b9b6825ec0f59fc8598db4fa6b51356979f413
244 Risk Score

Malware Insights

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

This PDF file was flagged by multiple critical heuristics as malicious, including a redirector link to dafemum.ru and a link farm hosted on disposable domains. The document body, though heavily obfuscated, contains text related to unit conversion, likely a lure. The presence of numerous external links suggests an attempt to direct the user to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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
  • 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/strik?utm_term=cuantos+centimetros+cubicos+tiene+1+mililitro In PDF document text
    • http://xoxosedefoxadu.mygamesonline.org/pijiwoguwunumumokut.pdfIn PDF document text
    • https://muzufuwuvul.weebly.com/uploads/1/3/2/3/132302955/3023883.pdfIn PDF document text
    • https://xekozetona.weebly.com/uploads/1/3/4/5/134508060/f499864a9d9.pdfIn PDF document text
    • https://jowatoziji.weebly.com/uploads/1/3/4/8/134893097/3969507bd94.pdfIn PDF document text
    • http://puduvab.sportsontheweb.net/differences_between_business_administration_and_business_management.pdfIn PDF document text
    • https://tatosemivuzufik.weebly.com/uploads/1/3/4/5/134599987/zupovige-zejix-pexiged-dadofezilapo.pdfIn PDF document text
    • https://gupoxebexu.weebly.com/uploads/1/3/4/3/134337811/2121139.pdfIn PDF document text
    • https://cdn.sqhk.co/gadukupuwe/hecjijc/ants_with_wings_are_they_termites.pdfIn PDF document text
    • https://dumuzuvo.weebly.com/uploads/1/3/4/6/134695275/b5b5623828db.pdfIn PDF document text
    • https://xifupanudolegu.weebly.com/uploads/1/3/1/1/131164204/7dc12154e0a7ae8.pdfIn PDF document text
    • https://cdn.sqhk.co/safubuguva/njehhn7/can_i_paint_over_varnished_wood_without_sanding.pdfIn PDF document text
    • http://wuxetij.mypressonline.com/98640395577.pdfIn PDF document text
    • http://nageramuvepom.mywebcommunity.org/what_trees_grow_well_in_central_florida.pdfIn PDF document text
    • https://jedifugidu.weebly.com/uploads/1/3/1/3/131382595/1061bedc75db.pdfIn PDF document text
    • https://cdn.sqhk.co/bovokolel/gijjjdk/adiga_adiga_song_lyrics_in_telugu.pdfIn PDF document text
    • https://cdn.sqhk.co/ratufewebu/dgZgdDZ/kevelevapuwovu.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
    • http://kerexiref.onlinewebshop.net/87881050503.pdfIn PDF document text
    • https://s3.amazonaws.com/devuxuzejozam/77779675119.pdfIn PDF document text
    • https://s3.amazonaws.com/sobaketemu/ropasodu.pdfIn PDF document text
    • https://s3.amazonaws.com/rozebofukixus/82391681644.pdfIn PDF document text
    • https://s3.amazonaws.com/jopomodilamego/zokikifevigavaxegin.pdfIn PDF document text
    • http://milebulijulami.onlinewebshop.net/jonepodugebik.pdfIn PDF document text
    • http://saxodanokijaj.atwebpages.com/can_quicken_2015_run_on_windows_10.pdfIn PDF document text
    • http://manosotidokef.myartsonline.com/trigonometry_10th_edition_lial.pdfIn PDF document text
    • https://s3.amazonaws.com/remufuzu/wixabusuvokuwo.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_off0000de93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE93 5040 bytes
SHA-256: b202d8b729e48a1d88f0da130ce631e4ba0c1cb922ddb7a20baf9bc846300dc3
font_01_sfnt_off0000efa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA1 11468 bytes
SHA-256: c5615698f54aa597f8cb21b60158520906ae42ba18d336e158d19416f1a86ba6
font_02_sfnt_off00011490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11490 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3