Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a8eec0b42ccebb1…

MALICIOUS

PDF

74.8 KB Created: 2021-05-14 15:11:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: c6276f39266db94246aa7fe30e7c1110 SHA-1: 25d9cb7f9ced91b61866cf0e55aa8a1dd366ae44 SHA-256: 0a8eec0b42ccebb1ea0137c2169efddee0e0688c0aebc611dc3638aa20d07c7a
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, containing a large number of external links to potentially malicious or SEO-spam related websites. The ML classifier and ClamAV also identified it as malicious. While no scripts were explicitly extracted, the PDF structure and extensive external linking suggest an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://lozipotod.ru/strik?utm_term=echo+string+trimmer+carb+adjustment PDF link annotation
    • http://wepijafiguwenan.mywebcommunity.org/91360792860.pdfIn PDF document text
    • http://tuduvodakep.mypressonline.com/pdf_to_word_mac_os_x_free.pdfIn PDF document text
    • https://wavopotajulaja.weebly.com/uploads/1/3/4/6/134631105/1285162.pdfIn PDF document text
    • https://cdn.sqhk.co/xamitarerivu/Hghdkhh/83542573039.pdfIn PDF document text
    • https://fotagajumiveba.weebly.com/uploads/1/3/1/4/131411987/656206.pdfIn PDF document text
    • https://kozewofedira.weebly.com/uploads/1/3/4/8/134899359/tuvaxizimedarefoliwe.pdfIn PDF document text
    • https://cdn.sqhk.co/dugelabomaw/gfhhhfz/bafolimizaraxesuwasobeni.pdfIn PDF document text
    • https://cdn.sqhk.co/dikozogub/qeggQgg/coniugazione_verbo_assistere_forma_attiva.pdfIn PDF document text
    • http://metarapuw.mypressonline.com/cards_against_humanity_expansion_german.pdfIn PDF document text
    • https://wewiruvikaju.weebly.com/uploads/1/3/0/7/130775929/5797872.pdfIn PDF document text
    • https://pizudakuputip.weebly.com/uploads/1/3/5/3/135347645/755cdd26f.pdfIn PDF document text
    • https://cdn.sqhk.co/gujowaxexag/ihijdol/pigirej.pdfIn PDF document text
    • http://melowew.scienceontheweb.net/english_sentences_with_marathi_meaning_download.pdfIn PDF document text
    • http://favodokoleti.mypressonline.com/68247708378.pdfIn PDF document text
    • https://zulusoneruw.weebly.com/uploads/1/3/4/8/134887175/9049d7696.pdfIn PDF document text
    • http://vykupavto54.ru/kawusajubekodejinemissw579.pdfIn PDF document text
    • https://xuzuvakewose.weebly.com/uploads/1/3/1/6/131637797/mupuboxiwabanaseriw.pdfIn PDF document text
    • https://fexalikinuzumow.weebly.com/uploads/1/3/5/3/135324316/bapomivi-tadopamitan-gijepodazabimo-vuzud.pdfIn PDF document text
    • https://cdn.sqhk.co/sunidoxil/aO6Jcgg/30911130429.pdfIn PDF document text
    • https://disaximineta.weebly.com/uploads/1/3/4/8/134883765/9c8607143a6f4ae.pdfIn PDF document text
    • http://copyright-supporthelp.com/gokekifimo7kwcw.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wukevivetarapu.myartsonline.com/1099298409.pdfIn PDF document text
    • http://vutogebufuz.myartsonline.com/40510267505.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_off0000e7e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E0 5496 bytes
SHA-256: 9b5e6c44f35928871e4cc1be733612b2f2598dc83b5e20ca9278d3cacadf4764
font_01_sfnt_off0000fa65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA65 10308 bytes
SHA-256: e917bdbd69e6f7a6b8bb979741e4f0ca773a294d77dd837d6d0c84c8f24bb5b9