Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b434400df73164a…

MALICIOUS

PDF

79.2 KB Created: 2021-03-28 01:13:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: c01dac49b954b4e6b18f85919683e814 SHA-1: ce39daef5dbfda988dc68527cde22b37016e15e9 SHA-256: 4b434400df73164ab43f6de1d8c22e6db1c822a57f7db84a9bfa08c5a390dc2a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains and link farms, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content, likely involving JavaScript execution within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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 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/award?keyword=kalimat+ambigu+pdf PDF link annotation
    • http://priz24.site/place_of_adverbs_exercisesjnpj3.pdfIn PDF document text
    • http://sayseedokg.com/60257290827c5pqe.pdfIn PDF document text
    • https://vulewerogoxo.weebly.com/uploads/1/3/4/5/134507491/166690.pdfIn PDF document text
    • https://dulewidojupetor.weebly.com/uploads/1/3/2/6/132695372/7649518.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • http://ezfix.asia/logitech_k520_keyboard_layoutmnik8.pdfIn PDF document text
    • http://form-lnstagramverificationbadge.com/54412763402i06wo.pdfIn PDF document text
    • http://bekokax.getenjoyment.net/circuit_training_for_weight_loss.pdfIn PDF document text
    • http://getsalle.xyz/mofomexijti7lm.pdfIn PDF document text
    • https://lamixanusagexog.weebly.com/uploads/1/3/5/3/135317293/tevazubufitem.pdfIn PDF document text
    • http://sarawavenudiwap.mygamesonline.org/tepazovumuzemewapifef.pdfIn PDF document text
    • http://wumiwuzigimo.mywebcommunity.org/55450511962.pdfIn PDF document text
    • http://sosed.market/72171116158uh2n7.pdfIn PDF document text
    • http://snapchat-alert.com/2268177946ps2sv.pdfIn PDF document text
    • http://zanovekolasin.mywebcommunity.org/how_to_use_elgato_game_capture_hd60_s.pdfIn PDF document text
    • http://yatvoyya.fun/55900927570i65uo.pdfIn PDF document text
    • https://pukakiliratof.weebly.com/uploads/1/3/4/7/134768090/1792552.pdfIn PDF document text
    • http://graatorama.fun/600-20_army_command_policyvu6st.pdfIn PDF document text
    • http://cethq.xyz/nizalejoritabuf87v8g.pdfIn PDF document text
    • http://top-odejda.com/kufijobelusurodewafinodaa463i.pdfIn PDF document text
    • http://ludirobus.getenjoyment.net/suvipamid.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xomapagovujux.atwebpages.com/asus_x205ta_upgrade_ssd.pdfIn PDF document text
    • http://sajomapujozokux.onlinewebshop.net/mifeso.pdfIn PDF document text
    • http://novogizeboje.myartsonline.com/personal_pronouns_worksheet_grade_3.pdfIn PDF document text
    • http://gixiluvigatekij.atwebpages.com/47204522248.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_off0000f8bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BF 5196 bytes
SHA-256: 8fea9d079d32e73e6538ed66101ad824dd60cce52047f9cd93aead7063e91d64
font_01_sfnt_off00010a67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A67 10552 bytes
SHA-256: ed4cb24aa059dbcac3c79750aa6c7d2f0110313e0421fb613a6d11dd5f777e4a

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