Malicious PDF — malware analysis report

Static analysis result for SHA-256 85b71f6d44fefc3b…

MALICIOUS

PDF

78.7 KB Created: 2021-03-09 10:00:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 10535cadb5298dd7ac1f037a156b631d SHA-1: 73d0dce68353624b6b2b689f98c6e71df0e7cd62 SHA-256: 85b71f6d44fefc3b302441a5cc22c3042cd7a302d66a599e3675b497c30bc8f9
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to potentially malicious content or phishing sites.

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://pelibifir.ru/123?utm_term=iifa+award+show+2019 PDF link annotation
    • https://cdn.sqhk.co/rosomugimo/ianifje/nuwedusimominoteb.pdfIn PDF document text
    • https://cdn.sqhk.co/zimidenex/b9AS5hh/haunted_house_where_you_shoot_zombies_with_paintballs.pdfIn PDF document text
    • https://cdn.sqhk.co/nosimasiv/jdmJihT/music_player_app_for_pc_windows_10_download.pdfIn PDF document text
    • https://ratopavitakam.weebly.com/uploads/1/3/4/4/134460251/4528329.pdfIn PDF document text
    • http://kawafopi.mygamesonline.org/55076854475.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371004/normal_5fcb62bd807fd.pdfIn PDF document text
    • http://giwitijudaleka.mygamesonline.org/how_to_setup_pioneer_touch_screen_radio_bluetooth.pdfIn PDF document text
    • https://fotelosalif.weebly.com/uploads/1/3/4/4/134463398/zitaku-tilojez-ramob.pdfIn PDF document text
    • https://rofasaxoropop.weebly.com/uploads/1/3/5/3/135316675/4882839.pdfIn PDF document text
    • https://cdn.sqhk.co/mudaxomemut/jgLBjcs/23680472964.pdfIn PDF document text
    • https://cdn.sqhk.co/porosobof/iM0viDU/zejexedumufemuvivamazag.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500887/normal_5fcec2a874310.pdfIn PDF document text
    • http://jorowijedo.mywebcommunity.org/51158501187.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3c199e1c-ff83-4553-a351-db1e9419129c.filesusr.com/ugd/424a74_dde1ae6d190241b192f29f322af63b00.pdf?index=trueIn PDF document text
    • https://73b3f487-90f5-41a6-bf44-750372f72efd.filesusr.com/ugd/39e8d0_7d131953b0264b198ccd10c50eb661e7.pdf?index=trueIn PDF document text
    • https://e05653fc-386e-4c8b-889d-738aee72c63e.filesusr.com/ugd/62421a_4462a92cdb9a4cfc8209cd41b2b2ee6e.pdf?index=trueIn PDF document text
    • http://mugazukadum.onlinewebshop.net/why_animal_sacrifice_in_old_testament.pdfIn PDF document text
    • https://413f70bc-0247-4a04-a3fc-eabb14e2b93f.filesusr.com/ugd/f18ee6_5a5a49b622184cd5816ff87217e441fe.pdf?index=trueIn PDF document text
    • https://979cd01f-16ea-4d2c-b189-234964c95597.filesusr.com/ugd/d4c4cf_99e6020ab888434da21b61dfe926ae84.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CC 5472 bytes
SHA-256: c419565b6d8a7368a04c2752aa33b3dcab6e647104173d02b5cc39d11ed5fc94
font_01_sfnt_off0001067a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067A 11964 bytes
SHA-256: 5ea15719d90c0257edefdc1f88f171ac40efa6f028226b311e34e222529ba249

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