Malicious PDF — malware analysis report

Static analysis result for SHA-256 833d1fc5158c6501…

MALICIOUS

PDF

79.6 KB Created: 2021-05-19 10:45:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: cef3c1cda9c0012c1c396fd61d1b8dbd SHA-1: dee54d313b1526092d1e4696c3ab2a92026c2451 SHA-256: 833d1fc5158c650121cbae3a6cc775b26b779a56c8b5fdfb887e3ff25653e160
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous external links, including a redirector URL, indicating an attempt to direct users to malicious websites. The 'PDF_SEO_LINK_FARM' and 'PDF_SEO_UTM_REDIRECTOR_LINK' heuristics strongly suggest this is a phishing or malware distribution lure. ClamAV also detected this file as 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://pelibifir.ru/strik?utm_term=que+es+el+acto+locutivo+ilocutivo+y+perlocutivo PDF link annotation
    • https://vusekuzobogurow.weebly.com/uploads/1/3/5/3/135327372/1254087.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447626/normal_6022fa294e780.pdfIn PDF document text
    • https://ginugifugebiner.weebly.com/uploads/1/3/4/2/134234672/vubok.pdfIn PDF document text
    • http://neluvukod.22web.org/bufupokurisanudip.pdfIn PDF document text
    • https://litodamun.weebly.com/uploads/1/3/4/7/134710511/9717799.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369163/normal_5ff14fbddf9a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401973/normal_603cca4e39bba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468530/normal_5fc90e460df37.pdfIn PDF document text
    • https://mitanifujokuvu.weebly.com/uploads/1/3/0/9/130969645/pojomixudebero.pdfIn PDF document text
    • http://xexewolos.iblogger.org/why_do_companies_want_to_list_on_the_stock_exchange.pdfIn PDF document text
    • https://loxogekero.weebly.com/uploads/1/3/4/0/134040689/rufemivuledupezip.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wajifinome.epizy.com/rumovekabixowikat.pdfIn PDF document text
    • https://s3.amazonaws.com/kabisebax/alina_baraz_songs_free.pdfIn PDF document text
    • http://foripoj.epizy.com/sexuzenuk.pdfIn PDF document text
    • https://s3.amazonaws.com/pisedij/celine_dion_ashes_song.pdfIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/guidelines_lupus_anticoagulant.pdfIn PDF document text
    • https://s3.amazonaws.com/lazolu/kemawev.pdfIn PDF document text
    • http://ximogubofew.epizy.com/best_korean_sheet_mask_for_oily_skin.pdfIn PDF document text
    • https://s3.amazonaws.com/widuxade/is_harry_potter_available_on_audible_plus.pdfIn PDF document text
    • http://zuzimekot.rf.gd/67120048189.pdfIn PDF document text
    • http://wusudafatuzawe.epizy.com/cocktail_attire_vs_semi_formal.pdfIn PDF document text
    • https://s3.amazonaws.com/votawawo/o_que_significa_movimento_uniforme_na_fisica.pdfIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/apologia_biology_lab_sheets.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_off0000f52b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52B 5152 bytes
SHA-256: e419d5c198d312fb00c006949e415f79e7ff6b3dcbc12dca479d44481ae49b46
font_01_sfnt_off000106cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CB 12328 bytes
SHA-256: a4b0fb9ab621ce7339bc66038dbcd97bbfa01c406b7c385a575778322cb71bf7