Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a427ff6544dc7b5…

MALICIOUS

PDF

86.3 KB Created: 2021-04-29 18:40:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: be5f4d53d6e8dadaae6cd2207d6b1b82 SHA-1: b8ed43e9880feecc939af96766257aeb37a91f25 SHA-256: 9a427ff6544dc7b5eebafecfeee1f74df55cdf708dadda4b6066235aa496d89f
134 Risk Score
Tags
free-cdn-ebook-manual-lure

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://zajinet.ru/strik?utm_term=python+3+download+image+from+url PDF link annotation
    • http://lnstagramcentre.net/sonasusilitobozasulapivog79gs.pdfIn PDF document text
    • https://cdn.sqhk.co/mifijizudi/gjgaji1/gikijemogoxet.pdfIn PDF document text
    • http://bijipejip.iblogger.org/tezipi.pdfIn PDF document text
    • https://cdn.sqhk.co/webuzifinuno/aie2ibl/nogejabinekabaziv.pdfIn PDF document text
    • https://cdn.sqhk.co/kulizuxekume/jAhj9QP/nuwikawepowufepamo.pdfIn PDF document text
    • https://cdn.sqhk.co/vilonunufuk/ahhxge0/sniper_elite_4_xbox_one_split_screen.pdfIn PDF document text
    • https://cdn.sqhk.co/buxifuludo/hdhgqjg/leap_of_faith_dance_studio_poplarville_ms.pdfIn PDF document text
    • http://lunesygets.xyz/52553935997bevdv.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/mozedijiz/martin_luther_king_jr_letter_from_birmingham_jail_summary.pdfIn PDF document text
    • http://wekumut.epizy.com/xupotoxut.pdfIn PDF document text
    • http://wiwolobeduju.rf.gd/tejafebenonagisodosulup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e92c35e6-5f30-4eee-8946-32a68c903a2e/what_is_a_peoples_choice_award.pdfIn PDF document text
    • http://jelazib.epizy.com/biopsychology_pinel_10th_edition_free_download.pdfIn PDF document text
    • http://vikipabolukizi.rf.gd/71993810735.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0690ca8e-b2b7-4da5-9914-84c89989e0c7/xikus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/946cddc4-f282-4288-b071-d3ed9bc0df33/kuriz.pdfIn PDF document text
    • http://zesivukawavomu.rf.gd/shane_by_jack_schaefer_chapter_1.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/tawewad.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10143 3988 bytes
SHA-256: 0cbda9b3ab36355017eacf95a4f788c79d4d10d8fd207eb3fd8f57278c337caf
font_01_sfnt_off00010f50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F50 5500 bytes
SHA-256: a848b859c65e0c903fc4627a9fc850e68b8452c03888d6e716780b99d4a1a928
font_02_sfnt_off000121fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121FA 11692 bytes
SHA-256: 237d67203511c1c21e4a0b0f07666ca92de699c15a5a97204bd1d8dc1ec6b4a0

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