Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bda961c19d85938…

MALICIOUS

PDF

75.6 KB Created: 2021-03-06 14:27:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 554a4b1c1b53bb475c63c06c7078b8f5 SHA-1: 371ebbee59ba7fc78038bc50753895001c29d51f SHA-256: 8bda961c19d85938edf5418ca953e8973bf4e04f61f63f608d1a349a4d3a6e63
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and a heuristic identifies it as a link farm. One prominent URL, 'https://midufefew.ru/wix?keyword=draw+the+circle+book+pdf', suggests a lure to disguise malicious intent. ClamAV detection and ML classification strongly indicate maliciousness, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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://midufefew.ru/wix?keyword=draw+the+circle+book+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4388820/normal_5fed7f1332415.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366949/normal_600ebe3cc7c13.pdfIn PDF document text
    • http://andyhong.blog/black_powder_reloading_manualt37wm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471688/normal_602c12e4005ca.pdfIn PDF document text
    • http://beviluxenumiliv.mywebcommunity.org/which_of_the_following_molecules_can_exhibit_hydrogen_bonding_as_a_pure_liquid.pdfIn PDF document text
    • http://profaudit32.ru/access_2016_date_time_format0cef4.pdfIn PDF document text
    • https://takoremitivo.weebly.com/uploads/1/3/0/7/130738963/7615731.pdfIn PDF document text
    • http://aires.fun/csi_exponential_functions_and_logarithms_answers1aqcz.pdfIn PDF document text
    • http://netlysy.online/70777300211lrx1n.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424647/normal_5fec78fce1e81.pdfIn PDF document text
    • https://logutidukikov.weebly.com/uploads/1/3/1/3/131380383/4011138.pdfIn PDF document text
    • http://bcpreactiva-enlinea.com/nugabedovodazoxuw7a7bv.pdfIn PDF document text
    • http://tatanip.medianewsonline.com/31223258927.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387712/normal_5fd15ec9c6e5e.pdfIn PDF document text
    • http://koprovk.xyz/29049099206oth8e.pdfIn PDF document text
    • http://nely.xyz/53625384175vm32a.pdfIn PDF document text
    • http://lololoj.sportsontheweb.net/hp_photosmart_d110_printer_wont_print.pdfIn PDF document text
    • https://gugozakeku.weebly.com/uploads/1/3/4/5/134588211/3437132.pdfIn PDF document text
    • http://xviiivbgz.com/zadepuvoj9is48.pdfIn PDF document text
    • http://meinekarten.best/avengers_streaming_englishmlwjm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407306/normal_5ff7c6cd42568.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486745/normal_5fcb69f149daf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368762/normal_60421a4646c4b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451949/normal_5fc7a839c9a1d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nokejufesuw.atwebpages.com/modosuzigamati.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_off0000ec3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3B 5360 bytes
SHA-256: 4af901461e61357eeb36fcb5d2d8e40121c77b4e028514b468f9bd13db1aa417
font_01_sfnt_off0000fe87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE87 10128 bytes
SHA-256: f0636ada05ed70f4281225d4f60eefeaaf33993214875d352a3544ba5f6749e2

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