Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a8179112ba04ef8…

MALICIOUS

PDF

76.1 KB Created: 2021-03-24 10:36:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 564436784479d5aac12825c3f4ab185e SHA-1: fca8823f4f4cd33fa53fbf0ce2a983200f6060e0 SHA-256: 7a8179112ba04ef88e274519b0e458113b81ac90a31f682ed3b30e65dd52c2b1
184 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The ML classifier also flagged this PDF with high confidence. The embedded URL leads to a site that appears to be part of a link farm, suggesting a phishing or scam attempt to drive traffic to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/award?keyword=bryophytes+mcq+pdf In PDF document text
    • http://tufuwavaziga.mygamesonline.org/wanotesilova.pdfIn PDF document text
    • http://fibipowokogo.sportsontheweb.net/60426946085.pdfIn PDF document text
    • http://ripugusulufiluj.getenjoyment.net/51060629778.pdfIn PDF document text
    • http://nebemor.mywebcommunity.org/what_are_some_cool_hobbies.pdfIn PDF document text
    • http://rejorevubirobu.sportsontheweb.net/att_4_handset_cordless_answering_system_manual.pdfIn PDF document text
    • http://wewogokuwidu.mywebcommunity.org/tenofinolumez.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/977d2e8b-6fd1-4576-87dc-c0b2349397e6/nipogefiwizovazolenonuxaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dab01b73-9d4a-403c-a2c6-fb7d0d75632b/how_to_lose_weight_fast_no_exercise_no_diet.pdfIn PDF document text
    • https://s3.amazonaws.com/legipalofi/libro_conamat_calculo_integral.pdfIn PDF document text
    • http://bilunijo.epizy.com/adjectives_and_adverbs_worksheet_year_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df5ddbfb-6db7-4fef-913c-1989398ea694/warm_bodies_trailer_reaction.pdfIn PDF document text
    • http://livirava.atwebpages.com/lilomixofil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d47abb73-ca92-4531-82c4-8a26b142ac18/the_death_cure_book_vs_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/lorerexeg/58099211559.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac41d5f3-4451-4b4c-a67f-c1a6234612f1/83400164595.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a110c28-bcf9-4273-a142-4d0724cb31c0/pofonovexudowevuwa.pdfIn PDF document text
    • http://kinadawefenipe.rf.gd/zuxuduza.pdfIn PDF document text
    • http://dozopedatofol.atwebpages.com/gewukedeluta.pdfIn PDF document text
    • http://rozakoxufe.epizy.com/audacity_full_crack_google_drive.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab9d01b6-738a-4d07-bb3f-f68456a8f652/how_to_fix_a_badger_500_garbage_disposal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ba6cea2-2c88-4589-8e2b-f518fd77e3f1/how_many_points_are_scrabble_letters_worth.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_off0000eb96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB96 5432 bytes
SHA-256: 7c032069307146deb425716e165e5006273e5572c0159d0efc53419a073d0b73
font_01_sfnt_off0000fdf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF3 10924 bytes
SHA-256: 59855096b3299a47fc37b3ad1539a8873c5c30223643206b26b1e81e4660e930

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