Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8c885e0d53b14e1…

MALICIOUS

PDF

73.9 KB Created: 2021-03-22 05:22:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8836d8327092c241328e750425730fc2 SHA-1: 23d5528a645fca10b5eb01fb2efb8480c8fc2114 SHA-256: c8c885e0d53b14e1448d883b38f34623e263a0c52e374ab168428b1ea6febfc2
196 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of an advance-fee scam, as indicated by the 'SE_ADVANCE_FEE_SCAM_LURE' heuristic. It contains numerous external links, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection further support its malicious nature. While no scripts were explicitly extracted, the presence of external URLs and the scam lure strongly suggest an intent to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://mezovuduw.ru/wix?keyword=vertebrates+and+invertebrates+worksheet+grade+4
    • https://pusesame.weebly.com/uploads/1/3/4/6/134662227/xapabuwazuzow-natoraze-viletu.pdf
    • https://xinotetul.weebly.com/uploads/1/3/5/3/135351743/dotagokatale-xiwigamop-gagadejozox.pdf
    • http://tozufokoxogo.22web.org/witobutafume.pdf
    • http://kefudepoduwudi.sportsontheweb.net/what_is_a_good_sat_score_for_11th_grade.pdf
    • https://wikoxunorature.weebly.com/uploads/1/3/5/9/135968981/5346896.pdf
    • https://gotukedefiwukub.weebly.com/uploads/1/3/5/3/135309477/b7a996.pdf
    • https://jewigilimeb.weebly.com/uploads/1/3/1/4/131408849/vivex.pdf
    • https://kakujaboregoj.weebly.com/uploads/1/3/5/3/135341432/4013752.pdf
    • http://lawusuzad.iblogger.org/when_did_the_great_depression_start_and_end.pdf
    • https://cdn-cms.f-static.net/uploads/4481675/normal_601fb8da206f5.pdf
    • https://latewumopinigan.weebly.com/uploads/1/3/4/3/134313498/zuxofi-vebimoxejodumo-merivewuxu.pdf
    • https://cdn-cms.f-static.net/uploads/4495400/normal_6011b0163624c.pdf
    • http://pusokum.66ghz.com/jadito.pdf
    • https://cdn-cms.f-static.net/uploads/4448346/normal_600f8c35aea31.pdf
    • https://cdn-cms.f-static.net/uploads/4414677/normal_6037ebbcb77bf.pdf
    • https://giwitororozesal.weebly.com/uploads/1/3/4/6/134652081/verem.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bodegifu.atwebpages.com/quality_management_certification_for_nurses.pdf
    • http://ditiruvovuluka.epizy.com/free_sad_cat_images.pdf
    • http://suwifubol.epizy.com/wumibew.pdf
    • https://uploads.strikinglycdn.com/files/e40d3a6a-0c67-4387-80b4-2b77ce5319ad/kobolopo.pdf
    • https://uploads.strikinglycdn.com/files/eac48a91-a89d-4ad4-b649-634af3a97acb/a_single_man_movie_netflix.pdf
    • https://uploads.strikinglycdn.com/files/801f9bed-edd5-41bc-bdc2-53b6fd0ee02c/malixujutuxojuvisimofaxo.pdf
    • http://pewubik.atwebpages.com/xadekibewevojivowisa.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2de.bin
aaf73af43f82a2d0a32da1d584d1986aa0ab96b390baa5546fba5894c361826f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DE 5464 bytes
font_01_sfnt_off0000f587.bin
85ca82f29fe68ccba45228b1c2b45611f64d23bc136ce5dcffa10fe76f5ecdfd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF587 10632 bytes

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