Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e90d87b07acf371…

MALICIOUS

PDF

85.7 KB Created: 2021-04-21 16:10:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: a3d2cb50a8dea4755f7a77178689593c SHA-1: 81087e2059ce7c1e4323f5d249709dc3e80d60ae SHA-256: 7e90d87b07acf371e5e189a96a77f9e8371240e27f907a8d590609d13fb60c23
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 0.9993

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://maypoin.ru/strik?utm_term=how+to+turn+on+envirotemp+water+heater PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4414679/normal_60579633402fb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451369/normal_5fcf10137c47e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369784/normal_602005c9784ee.pdfIn PDF document text
    • https://wovofonunubani.weebly.com/uploads/1/3/1/4/131408017/kanozewilutem.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367640/normal_5ffb95e4e3459.pdfIn PDF document text
    • http://mishgen.com/308589230570x5et.pdfIn PDF document text
    • http://helpcreditscore.info/124009224595866p.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367633/normal_60137fcd82dd3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479673/normal_6004ba90487af.pdfIn PDF document text
    • http://itsnat.space/gregorian_calendar_date_format_javascriptcg7ob.pdfIn PDF document text
    • https://mutosonagok.weebly.com/uploads/1/3/4/3/134316738/zevojobujixuta.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486994/normal_5fd826dc0f5e0.pdfIn PDF document text
    • https://ruwixotuso.weebly.com/uploads/1/3/4/1/134131383/rosusofixug-jebosaluzuzoje.pdfIn PDF document text
    • https://pibefabetanob.weebly.com/uploads/1/3/4/3/134376782/775101.pdfIn PDF document text
    • https://nafogoke.weebly.com/uploads/1/3/4/7/134776139/2741339abcf3011.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405430/normal_6045e33a787a0.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/b9f45262-d8a0-4fa2-be33-45a0cf63f339/85275648173.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fc58245-901b-4071-a552-2b7730ed352c/which_is_the_best_doro_mobile_phone.pdfIn PDF document text
    • https://s3.amazonaws.com/nimuwet/25574060297.pdfIn PDF document text
    • https://s3.amazonaws.com/masevewi/tufaketezawideridazof.pdfIn PDF document text
    • https://s3.amazonaws.com/xovekolamoxe/the_secret_language_of_destiny_free.pdfIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/sedra_smith_microelectronic_circuits_7th_edition_solutions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d72a3938-4b8d-4e00-93f2-46953af76972/gegogodonaraporowuxe.pdfIn PDF document text
    • https://s3.amazonaws.com/gitipelut/clauses_and_phrases_worksheet.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_off000112d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D0 4960 bytes
SHA-256: 668ec1fee2711324bc4b41ddbe926936c7185c96de974416ae52606533566e60
font_01_sfnt_off00012395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12395 10920 bytes
SHA-256: 140e8ee78f7593407351cf78ad7c646bcaebb367546d00b6a035d7f7ae5cad1e

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