Malicious PDF — malware analysis report

Static analysis result for SHA-256 33f71a82b25f8434…

MALICIOUS

PDF

98.5 KB Created: 2021-04-25 15:03:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 605ef9b36097e4df48a0114e63879f7c SHA-1: 9574961eaecbb64204fd7a42fe38e248ce0a883e SHA-256: 33f71a82b25f8434a44e34aa40637fa2ec3f9b37cb5c2564f156e6fd2c9d0624
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://dugedepap.ru/strik?utm_term=guess+how+much+i+love+you+book+%2526+baby+cards+milestone+moments+gift+set PDF link annotation
    • http://swiss-family.space/paradise_lost_fileswwqo.pdfIn PDF document text
    • http://acupofjacob.com/zilowipuvugojileziff8no8.pdfIn PDF document text
    • https://nitipitu.weebly.com/uploads/1/3/0/7/130775162/zugoninezutorizek.pdfIn PDF document text
    • http://dakisemakegag.sportsontheweb.net/all_basic_chemistry_formulas.pdfIn PDF document text
    • https://faxemidarasagim.weebly.com/uploads/1/3/4/3/134341424/7323265.pdfIn PDF document text
    • http://uggi-ugg.com/how_to_write_an_essay_argumentativeag2aw.pdfIn PDF document text
    • https://gofazawadatefit.weebly.com/uploads/1/3/5/3/135349405/virasixozivupi.pdfIn PDF document text
    • http://hookup755.fun/when_did_the_wii_console_come_outbrg4y.pdfIn PDF document text
    • http://recepty-dd.info/44521312211qnmr2.pdfIn PDF document text
    • https://kerutefabiwemek.weebly.com/uploads/1/3/0/8/130874269/b86ba518bd.pdfIn PDF document text
    • http://zoomita.fun/latin_american_populism_in_the_twenty-first_century6mxth.pdfIn PDF document text
    • http://duwudivusupo.mygamesonline.org/janazuwubajoba.pdfIn PDF document text
    • http://bazis-rostov.com/81626295477mt2rn.pdfIn PDF document text
    • http://br1.red/new_girl_suit_photo_maker_princess_dress_upk54i8.pdfIn PDF document text
    • https://kifesajisibak.weebly.com/uploads/1/3/4/8/134884742/39a825.pdfIn PDF document text
    • https://fubofekibodubeb.weebly.com/uploads/1/3/4/4/134483790/7661852.pdfIn PDF document text
    • http://sixesijilolun.mywebcommunity.org/wobinawazunebiwi.pdfIn PDF document text
    • https://wepeweguwerixum.weebly.com/uploads/1/3/1/8/131856135/punurijofuto.pdfIn PDF document text
    • https://divakifemomo.weebly.com/uploads/1/3/5/3/135311574/2240615.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4f6c49ad-35c2-4e1b-a50e-a4ca4816ee30.filesusr.com/ugd/a28dad_4cb2fe785ff64a328ca6d5f1e6175340.pdf?index=trueIn PDF document text
    • http://nizowozutagele.atwebpages.com/mirevetodemowojap.pdfIn PDF document text
    • https://8b5ac0f3-2bc4-49a6-9a99-2541af31b215.filesusr.com/ugd/f2ef67_26fe0a5c085d4200a4a3c6045b871522.pdf?index=trueIn PDF document text
    • http://pabewuvuxaf.onlinewebshop.net/datawawojititewop.pdfIn PDF document text
    • https://aa3bb5c3-2bd4-4791-9e2a-6e31d5009b04.filesusr.com/ugd/60e703_e9658108ccc64f87aed01e9df7d52fb9.pdf?index=trueIn 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_off00013edc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EDC 5224 bytes
SHA-256: 5917baf048623c59d1b62272559aefc23a7d9080d874ab372aec62a8e983a414
font_01_sfnt_off000150a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150A5 12392 bytes
SHA-256: c4fc449b8605aee5bf2a25d1c7de3cc383f8cfb0febe774a9801f11ddc8778aa