Malicious PDF — malware analysis report

Static analysis result for SHA-256 947726c885eb0fab…

MALICIOUS

PDF

84.8 KB Created: 2021-02-24 00:30:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 14a688a788f671bc7db1e8458b19fc5e SHA-1: 5f316ee2043c31388ed14566ca3f019d501fb11f SHA-256: 947726c885eb0fabce8fdb76fe673020cdcf777cafdc0abe31c68039259f68d7
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded external URLs, with a critical heuristic firing for PDF_SEO_LINK_FARM indicating a mass external link farm. The ClamAV detection and ML classifier also strongly indicate maliciousness, specifically flagging it as Pdf.Phishing.Trojan. The presence of embedded URLs suggests a phishing or malicious redirection attack, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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/123?utm_term=aci+concrete+placement+llc PDF link annotation
    • http://kalavar.xyz/42954750516op8s.pdfIn PDF document text
    • https://monemoret.weebly.com/uploads/1/3/4/6/134667898/baferelatefotovor.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409604/normal_5fffefd3ea035.pdfIn PDF document text
    • https://bagamijak.weebly.com/uploads/1/3/1/3/131380043/d3a1d120e95.pdfIn PDF document text
    • https://tisolalaw.weebly.com/uploads/1/3/0/8/130814234/wuwedafibitanizobez.pdfIn PDF document text
    • http://jadebey-x.com/bully_2_game_for_pcrbold.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379363/normal_5fe79d3f42f5b.pdfIn PDF document text
    • http://vinnipoh.fun/xalasixiwivafagosujisu8w7pz.pdfIn PDF document text
    • https://vifejekim.weebly.com/uploads/1/3/5/3/135322606/e08e89fa5405.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/marimejerebo/octonauts_creature_report_sticker_book.pdfIn PDF document text
    • https://s3.amazonaws.com/fulazelof/best_washer_and_dryer_set_under_1_000.pdfIn PDF document text
    • https://s3.amazonaws.com/jamuluvuvava/lab_attendant_question_paper_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/narrative_of_the_life_of_frederick_douglass_chapter_11_analysis.pdfIn PDF document text
    • https://s3.amazonaws.com/vovopafubipu/nupopexatevalobamaro.pdfIn PDF document text
    • https://s3.amazonaws.com/dazifozixawus/agisoft_user_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/tidigudetefumof/cello_expressions_sheet_music_library.pdfIn PDF document text
    • https://s3.amazonaws.com/gogunabones/79481829020.pdfIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/tunuvu.pdfIn PDF document text
    • https://s3.amazonaws.com/wulotugadag/assurance_wireless_apn_settings_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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010fa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA7 4892 bytes
SHA-256: 8708d3be36c044cf64c775fe10b67be0cfe423126ee6db1b423e799d052aaa4b
font_01_sfnt_off00012034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12034 10960 bytes
SHA-256: c9a95185aefc19a433ea262d86e1b113815e126270cca8c2e4247964f0b52a5f

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