Malicious PDF — malware analysis report

Static analysis result for SHA-256 33ddb6a59dd47ac3…

MALICIOUS

PDF

80.7 KB Created: 2021-03-07 22:27:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b7aa43800db138fb6a44d320b29fb4c5 SHA-1: d2a8b04d05e21b6a19de22653bbc1c3c5569ef0d SHA-256: 33ddb6a59dd47ac3b75208a3c0a625025add3ba3a0ebe6d2682abf07fcdc2b16
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. While no scripts were explicitly extracted, the PDF structure and the nature of the links point towards an attempt to direct users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • 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.
  • 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 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://baarspo.ru/aws?utm_term=ejemplos+de+dialogo+formal+y+informal
    • https://kakowafalajoji.weebly.com/uploads/1/3/4/4/134455686/ludalovinopemur-geruxe-texagoxakugudoz-vefiwexuwak.pdf
    • https://lokejefu.weebly.com/uploads/1/3/5/3/135301848/5326488.pdf
    • https://piberarejini.weebly.com/uploads/1/3/5/3/135332679/b8b2334302.pdf
    • http://komarovskii.xyz/xogebuxuxavrd1r.pdf
    • https://seniwotod.weebly.com/uploads/1/3/5/3/135346371/dekejukarudinab.pdf
    • http://dufifudusimube.mygamesonline.org/tom_sawyer_theme_song_tagalog.pdf
    • https://toguvanamevodo.weebly.com/uploads/1/3/4/6/134615804/3781968.pdf
    • http://tafugegajotu.mygamesonline.org/how_do_i_know_when_my_zagg_keyboard_is_fully_charged.pdf
    • https://wipugetawunuw.weebly.com/uploads/1/3/5/3/135302850/3921791.pdf
    • https://tujozidu.weebly.com/uploads/1/3/4/6/134694944/pogaz.pdf
    • http://hushseo.online/tufofiqsovi.pdf
    • https://wapubepedud.weebly.com/uploads/1/3/1/4/131455956/vukisodixo.pdf
    • http://com-copyrighit.com/97839600768st70u.pdf
    • http://premial.su/penodurl1z7.pdf
    • https://lapudaxorekoj.weebly.com/uploads/1/3/0/8/130814283/c26679aeda.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/daselex/49558261387.pdf
    • https://305aa2e3-e1d2-413d-aa2e-f1bb83d03ded.filesusr.com/ugd/92ee2b_fecb08ea719249e18faea6f39f72ea8c.pdf?index=true
    • https://6cbe2f5c-748b-4bc6-b691-25a968a47885.filesusr.com/ugd/d6b5da_62adaf02e7b845c7bfe1c5a0eb4b76cc.pdf?index=true
    • https://s3.amazonaws.com/gorajikunobixi/flashpoint_comic_book_wiki.pdf
    • https://f9c81679-ddb1-4746-ab40-32673edc426c.filesusr.com/ugd/2eff39_84b455d34bfb40ad901d4c7cabaffd63.pdf?index=true
    • https://c064424b-11a8-4e39-a524-24a74bcd733d.filesusr.com/ugd/54e393_4cfd9123270a4dfa8b20bbc8660d5156.pdf?index=true
    • https://5e024257-ca51-40df-b6b5-a3104c7b7124.filesusr.com/ugd/97368a_be80bea2b2844cbab8366fcf9e8c4cf8.pdf?index=true
    • https://s3.amazonaws.com/jizubisetebof/xokujaxalodopedeme.pdf
    • http://pujumek.myartsonline.com/nys_drivers_license_renewal_appointment.pdf
    • http://pefimubis.myartsonline.com/78169345494.pdf
    • https://s3.amazonaws.com/vukujidor/quotes_about_success_and_hard_work.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9e1.bin
017a4bdda30337043cb909cdf18f15b56bb2ed1f7a3f7211ed92e09430f17ecb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E1 5496 bytes
font_01_sfnt_off00010c8e.bin
7a63a6ab6f1e6145f3e16d8ffb9c999eeb3bb8d0f14075cf8d1f3bb7ec0166c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8E 11888 bytes

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