Malicious PDF — malware analysis report

Static analysis result for SHA-256 6449c6aefc4fa1d7…

MALICIOUS

PDF

81.5 KB Created: 2021-01-29 04:36:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 041fc235982cf14551dd9cc75463d7ba SHA-1: cbf819dd260e20aadbca6f5842df3197c25a0869 SHA-256: 6449c6aefc4fa1d7c894a373fea1804c0e236e9a6b295e348d50fb20efef0f00
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains a large number of external links, many pointing to disposable domains, characteristic of a link farm used to distribute phishing content or malware. The presence of multiple external URIs and the overall structure suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/aws?utm_term=free++action+cartoon+photoshop PDF link annotation
    • https://duxoberadu.weebly.com/uploads/1/3/4/7/134718286/vejizojexi_sukumaxipezo_lepixosudetud_zinufa.pdfIn PDF document text
    • https://cdn.sqhk.co/jegamaxegev/eDypXja/vumuziduf.pdfIn PDF document text
    • https://cdn.sqhk.co/nunewole/iio7gie/magijabilazuxasa.pdfIn PDF document text
    • https://cdn.sqhk.co/gitopedevid/Im0hd52/holy_city_drive_in_facebook.pdfIn PDF document text
    • http://xenuven.22web.org/82418927042.pdfIn PDF document text
    • https://cdn.sqhk.co/doboketuzoj/ijgjiTL/amazon_echo_deals_black_friday_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/wunokebewoz/nsX7jbw/word_trip_level_492.pdfIn PDF document text
    • https://cdn.sqhk.co/bexutavukaro/bidihjj/ducktales_game_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/zazifutunoj/kgjzjdU/vuzewala.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xajejosiwoja.epizy.com/unearthed_arcana_artificer.pdfIn PDF document text
    • http://rejosunugewojif.epizy.com/batanubaxibugotoxe.pdfIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/wodunipi.pdfIn PDF document text
    • https://s3.amazonaws.com/sedimeraxufi/gejowukofu.pdfIn PDF document text
    • http://xebowuruno.epizy.com/63048784368.pdfIn PDF document text
    • http://fofanab.epizy.com/formule_de_bisulfite_de_potassium.pdfIn PDF document text
    • http://garapaf.epizy.com/global_perspectives_worksheets_for_grade_6.pdfIn PDF document text
    • https://s3.amazonaws.com/legipalofi/91535525734.pdfIn PDF document text
    • https://s3.amazonaws.com/vukusa/ancestors_the_humankind_odyssey_update.pdfIn PDF document text
    • http://pesufebavarobi.rf.gd/70183663953.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_off00010314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10314 4944 bytes
SHA-256: 4957e54a48b2169e92dd3f0ad1b5507d799ec8a13907466abe20badb1a6e2faf
font_01_sfnt_off000113df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113DF 10824 bytes
SHA-256: 46e6d65d80b7e03be471d3642444e6a341599cac23d36b8b15531fcd03880ad7

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