Malicious PDF — malware analysis report

Static analysis result for SHA-256 c62b3da0cacb83f9…

MALICIOUS

PDF

78.2 KB Created: 2021-03-29 00:09:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 0d330dcb5b9dbfaad0ae7beec8f5e7bd SHA-1: 204be41b7daea98227fbf9c0430f6631b2b2e17a SHA-256: c62b3da0cacb83f9657006745cae2d1fdc3694fbb2d59a23a0b9deb8980fdb06
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://crophysi.ru/award?keyword=cengage+maths+functions+pdf PDF link annotation
    • https://cdn.sqhk.co/dedizozife/0ngc7k0/95450953250.pdfIn PDF document text
    • https://daxuwolazu.weebly.com/uploads/1/3/4/3/134335064/jovibi_degabupe_dipivofowetuta.pdfIn PDF document text
    • http://wanididezaj.getenjoyment.net/campbell_ap_biology_11th_edition.pdfIn PDF document text
    • https://sowekunozo.weebly.com/uploads/1/3/5/3/135321923/jugesekibafifed.pdfIn PDF document text
    • https://bukenazupe.weebly.com/uploads/1/3/4/5/134584610/1533273.pdfIn PDF document text
    • https://difomojixi.weebly.com/uploads/1/3/4/3/134319012/5665723.pdfIn PDF document text
    • http://jinobuzid.scienceontheweb.net/43205082768.pdfIn PDF document text
    • https://leneguvajetuse.weebly.com/uploads/1/3/1/3/131380977/fupolezuf.pdfIn PDF document text
    • http://lewijufe.sportsontheweb.net/history_of_the_world_i_guess_jingles.pdfIn PDF document text
    • http://zefefiwova.medianewsonline.com/fofodonet.pdfIn PDF document text
    • http://memisada.mygamesonline.org/32152935003.pdfIn PDF document text
    • http://madawuboso.sportsontheweb.net/77134977866.pdfIn PDF document text
    • https://rajizoru.weebly.com/uploads/1/3/1/8/131856770/wasezexakira-kabebomubepu.pdfIn PDF document text
    • https://ragaxunuwad.weebly.com/uploads/1/3/1/4/131407405/d6056fd03b47981.pdfIn PDF document text
    • https://cdn.sqhk.co/mexovaru/zSjjhd3/fapixuxaxeluraxi.pdfIn PDF document text
    • https://beluwunugel.weebly.com/uploads/1/3/1/3/131380842/gomafo_gakal_bibevidu_murupobabojap.pdfIn PDF document text
    • https://tabogivazosepa.weebly.com/uploads/1/3/1/8/131871767/sawezagonasuvuzoke.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c36efdde-2309-4ce2-a10d-b6df2ce12cd8.filesusr.com/ugd/e98059_1d13920574f941b386e9f5c03424d0b9.pdf?index=trueIn PDF document text
    • http://rorazizaxaf.atwebpages.com/1.5_describe_angle_pair_relationships_worksheet_answers.pdfIn PDF document text
    • https://f6142301-0c02-44dd-b2c5-62cf9b3cd0dc.filesusr.com/ugd/ebfdba_c1a28779060d4168ab4d6e04589fb28f.pdf?index=trueIn PDF document text
    • http://medexode.atwebpages.com/51934282065.pdfIn PDF document text
    • http://tevefetilojas.atwebpages.com/vogemelodiwi.pdfIn PDF document text
    • https://d670dda7-df53-4ef1-8eda-d3256df28744.filesusr.com/ugd/dbbbec_83524588a114477d90310664a104c0cc.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE22 5348 bytes
SHA-256: 611b5a9a221dcd4344a2e2232ec6526b4b47bf8f5f54e3461e25cfc2ff9124d5
font_01_sfnt_off0000f034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF034 10764 bytes
SHA-256: 7a73390e14c9226663e64556091358b6173dfc1deb78f948be931a00bc12b8dc
font_02_sfnt_off0001153d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1153D 16384 bytes
SHA-256: 226a8e4e528c820945b068501793868e9b71e899c703a7ad804f9a2f424011a5