Malicious PDF — malware analysis report

Static analysis result for SHA-256 b35be392a30b4dbc…

MALICIOUS

PDF

76.4 KB Created: 2021-02-28 01:18:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: e0902d05537453a8ff4d13451c2976a9 SHA-1: f7ae14ffdf16234202871ca1d34e542b43eb42f8 SHA-256: b35be392a30b4dbce48475a1a2ef478c574a3f603e9447199d008cddc77ba4b5
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9997

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://leonvi.ru/wix?keyword=hitchhiker%2527s+guide+to+the+galaxy+thumb PDF link annotation
    • http://natur-bio.space/70306687783pvy4e.pdfIn PDF document text
    • http://kelijoninofi.22web.org/pilujibesupovitonubiki.pdfIn PDF document text
    • http://anbieterbewertung-autoscoutch.com/16797087674dkkxo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449422/normal_5fe2f8b088a95.pdfIn PDF document text
    • https://tupemewona.weebly.com/uploads/1/3/0/7/130775182/dazilupepo_bagimunab_wotokosuxafubik_mojuwi.pdfIn PDF document text
    • http://bupetud.xyz/numark_ttusb_turntable_dust_cover5kbor.pdfIn PDF document text
    • http://yesstore.pro/we_wish_you_a_merry_christmas_piano_tutorial_sheet_music_bossocp7e.pdfIn PDF document text
    • http://edarudost.online/lyle_mcdonald_the_womens_book_amazond7tvt.pdfIn PDF document text
    • http://creditstar-kabinet.com/william_faulkner_a_rose_for_emily_interviewhbbgw.pdfIn PDF document text
    • http://fapevenaxopaw.22web.org/vuboxodubijumawononamupu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448740/normal_602be861254f8.pdfIn PDF document text
    • https://biziremidawa.weebly.com/uploads/1/3/5/3/135397591/savibodudubap.pdfIn PDF document text
    • http://izzzaaa.space/60170083818vdo4l.pdfIn PDF document text
    • https://gufiferufa.weebly.com/uploads/1/3/2/3/132302963/cae03369.pdfIn PDF document text
    • http://chisto-chisto52.ru/maus_by_art_spiegelman_amazonvk385.pdfIn PDF document text
    • https://belawutuvuzepim.weebly.com/uploads/1/3/4/6/134605506/79df72299400c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lukepepe/tekevegeju.pdfIn PDF document text
    • http://mukukukeban.rf.gd/95155933398.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzumeb/6974851167.pdfIn PDF document text
    • http://zesivigodexewig.epizy.com/93826812563.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_off0000ecff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFF 5724 bytes
SHA-256: 25cfe084ece2183ad7641c4d369f9147e385fcec8da584f04d14eb5ce2032793
font_01_sfnt_off00010061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10061 10472 bytes
SHA-256: 6149f1a94e7a112f8d9b98fbd77b6aa56f89690b0844ad79cddb9b0cbc590aea

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