Malicious PDF — malware analysis report

Static analysis result for SHA-256 78936b0d4e32516d…

MALICIOUS

PDF

109.4 KB Created: 2021-04-03 00:01:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 57e586a7ad3ad7f17909909f7477ce06 SHA-1: c97fb7eb3c6c83883d39a9bbe9121a79116fdc6b SHA-256: 78936b0d4e32516d4190b9d3e99afd5a89bd28b584c09d5ce807662fe1b96618
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, contains keywords related to "epilepsy treatment guidelines" and "wkhtmltopdf", likely serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xajibur.ru/123?utm_term=epilepsy+treatment+guidelines+2014+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4450257/normal_6003658970c76.pdfIn PDF document text
    • https://benukozememig.weebly.com/uploads/1/3/4/4/134480731/8608624.pdfIn PDF document text
    • https://basitonivi.weebly.com/uploads/1/3/4/5/134584834/7179185.pdfIn PDF document text
    • http://ravovenovibu.medianewsonline.com/algerieinfo_80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487007/normal_602b0842d9371.pdfIn PDF document text
    • http://pobunav.sportsontheweb.net/jifomuwovaxit.pdfIn PDF document text
    • https://tugalebuwe.weebly.com/uploads/1/3/4/0/134012885/dejifesu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375702/normal_600e9639ac9ab.pdfIn PDF document text
    • https://lixojubenolida.weebly.com/uploads/1/3/4/3/134375882/foremata.pdfIn PDF document text
    • http://xawamiwupajev.mygamesonline.org/hp_deskjet_3052a_printer_setup.pdfIn PDF document text
    • https://gemitipob.weebly.com/uploads/1/3/4/4/134474898/9055063.pdfIn PDF document text
    • https://waniwuwaweduf.weebly.com/uploads/1/3/4/3/134348957/simaxavejoju-zarikixa-lurosoriko-tajerakeweja.pdfIn PDF document text
    • https://sabijodamibig.weebly.com/uploads/1/3/0/7/130775907/aecba4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488133/normal_6030ab5fbada9.pdfIn PDF document text
    • https://jikovezogid.weebly.com/uploads/1/3/1/4/131407088/tojopemare.pdfIn PDF document text
    • https://cdn.sqhk.co/zejejofe/WidaZih/14238265989.pdfIn PDF document text
    • https://ratamugokamilel.weebly.com/uploads/1/3/5/9/135959592/wibalomuwefe.pdfIn PDF document text
    • https://cdn.sqhk.co/mirofifuba/ghgjekv/monkey_d_luffy_family_line.pdfIn PDF document text
    • http://pinopizo.sportsontheweb.net/3569973620.pdfIn PDF document text
    • https://webonuru.weebly.com/uploads/1/3/1/4/131437172/7195879.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BC 38068 bytes
SHA-256: 4b773dbb407482bb7630a623759505e9d1cfafbb3b4f1bb7680f7b87a3605ebd
font_01_sfnt_off00016bff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BFF 5836 bytes
SHA-256: 68de4f6e2eb68ca301b9934dc10235c56cbfdcf2ab899a855098ad96e696abc8
font_02_sfnt_off00017fdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17FDC 12012 bytes
SHA-256: f24f66c3ebccdf785ee36bc8b8f83c330c728cf360c604e2a4ae1e17dbd03cb2