Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a3860faa93300e3…

MALICIOUS

PDF

108.1 KB Created: 2021-03-29 12:53:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5efa34987b99eba65fa22392e2988910 SHA-1: ebb07ec2b080d15224360b7e545adcd8381d1d67 SHA-256: 4a3860faa93300e39936dab8f47c853dc229f3da1e2bbdf1dee0fedd8ac95cea
126 Risk Score

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 0.9978

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://dafemum.ru/strik?utm_term=security+analysis+and+portfolio+management+pdf+books+free+download PDF link annotation
    • http://moreprodukti.com/pafukekopnzr5x.pdfIn PDF document text
    • https://cdn.sqhk.co/wavudasawete/djjOjbn/camstudio_for_windows_10_64_bit.pdfIn PDF document text
    • https://cdn.sqhk.co/minederepa/jcQNQIb/bingo_live_75_online.pdfIn PDF document text
    • https://cdn.sqhk.co/vobipibomuk/4ggSbij/20751394446.pdfIn PDF document text
    • https://cdn.sqhk.co/dagizonu/mgggfwS/niwofulelexasamep.pdfIn PDF document text
    • http://tesopinafap.22web.org/igora_royal_color_instructions.pdfIn PDF document text
    • https://cdn.sqhk.co/vimexuda/idvchiT/3d_planets_model.pdfIn PDF document text
    • http://springital.fun/gololimus23mf.pdfIn PDF document text
    • https://cdn.sqhk.co/befozaxulot/ibJjhkN/wwe_rumors_and_spoilers_money_in_the_bank.pdfIn PDF document text
    • https://cdn.sqhk.co/vumuwilaj/fOUihia/mindset_quotes_carol_dweck.pdfIn PDF document text
    • http://naturaitalia.space/najazumixuxitujjxral.pdfIn PDF document text
    • https://cdn.sqhk.co/wogokodu/ifnlFgh/vetilevonewotep.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2c861e0-ae60-4ca1-b8d9-8dd66d9b2e95/gugudadazukovomejapa.pdfIn PDF document text
    • http://vibizif.epizy.com/concrete_and_abstract_nouns_exercises_with_answers.pdfIn PDF document text
    • http://fubefav.rf.gd/allyn_and_bacon_guide_to_writing_7th_edition_free.pdfIn PDF document text
    • http://zalowakudedakov.rf.gd/51058398803.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c320fc1e-729f-4150-8412-a5572e4736a0/koremoxefakigaxulokat.pdfIn PDF document text
    • http://ximuxulizi.myartsonline.com/buku_biomassa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc9b2923-582d-4bc6-9638-cf76e92d6b2a/verifone_ruby_2_commander.pdfIn PDF document text
    • http://gototura.myartsonline.com/litesaxafikifoxisuzelo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4069f25d-7f34-4847-96e6-36e6e40c27da/10_000_reasons_matt_redman_lyric_video.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6acd396-d288-43a8-9d0c-c28f03d671b3/44653663465.pdfIn PDF document text
    • http://nilidori.rf.gd/wearable_activity_android.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013ded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DED 3124 bytes
SHA-256: eeb027d45c2c7799395baab069865b1bccd6f5c4de19d2dcee9834ec78364736
font_01_sfnt_off00014915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14915 5976 bytes
SHA-256: 0da49051a3b025b75e218e6d17ad83769cd4c79619bd7b9df9057f1a44ad5984
font_02_sfnt_off00015d69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D69 13092 bytes
SHA-256: 9f8f07e7464414b2a08f3344a372851846f2dd1e71c45f4c5faf831ba3d2307d
font_03_sfnt_off000189cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x189CD 16232 bytes
SHA-256: b24653143e2fe272fd4cb9068e5bd150ef3a073b8f7b118090b05474f8286002