Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c668d97a9f7018e…

MALICIOUS

PDF

90.1 KB Created: 2021-04-05 07:04:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: da39d739f375dc791ebc6ed2adddf0a3 SHA-1: dc47c29e57202f302f1148f26e61589641a6d43d SHA-256: 7c668d97a9f7018ea08db36d6b6b997c78d1df2d19b33ced211c8501179dc25e
256 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains multiple heuristics indicating it is a phishing lure, specifically impersonating Outlook to steal credentials. It leverages a link farm and redirector to obscure the final destination, which is a phishing page. The ML classifier and ClamAV detection further support its malicious nature. No scripts were extracted, but the presence of external links and the phishing lure are strong indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://nelemiken.weebly.com/uploads/1/3/4/7/134704654/duzapubitutawabu.pdf.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://kuzutuzo.ru/award?keyword=neo+classical+school+of+criminology+pdf PDF link annotation
    • http://jiwapadenejeza.getenjoyment.net/kugeme.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490365/normal_6029a3ea06393.pdfIn PDF document text
    • http://sitebomobegux.sportsontheweb.net/pdf_blockchain_revolution.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386347/normal_5fce280faf334.pdfIn PDF document text
    • https://nelemiken.weebly.com/uploads/1/3/4/7/134704654/duzapubitutawabu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484805/normal_6029acd6cbd3e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461777/normal_5fdfc86a69228.pdfIn PDF document text
    • https://vosovijuz.weebly.com/uploads/1/3/0/8/130813614/d8cc0b386612.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387562/normal_60469cc9bd854.pdfIn PDF document text
    • http://fosavaxenu.mypressonline.com/rational_equations_worksheet.pdfIn PDF document text
    • https://nanavefog.weebly.com/uploads/1/3/0/7/130775134/dasedojewufix-senatamujake-napelixif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502248/normal_605280ae251dc.pdfIn PDF document text
    • http://zefujixa.mywebcommunity.org/45878298946.pdfIn PDF document text
    • https://napolapivu.weebly.com/uploads/1/3/5/3/135303388/xiwirex_duguset_mijajopenukufer_wuruzis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jidagafinuxesu/viwamuterivonigaw.pdfIn PDF document text
    • https://s3.amazonaws.com/degagaziv/cotton_house_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/sikuva/89347449148.pdfIn PDF document text
    • https://s3.amazonaws.com/zamuriza/tawepesubojibudofuwona.pdfIn PDF document text
    • https://s3.amazonaws.com/jaloto/format_lecture_liseuse_kindle.pdfIn PDF document text
    • https://s3.amazonaws.com/tobito/game_of_life_2_free_pc.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_off0001131e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1131E 5348 bytes
SHA-256: 67c3a83a2f26d473a3678f386503a863daea578ae4a12ee5bd9b2bbbd3894ed4
font_01_sfnt_off0001251c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1251C 11856 bytes
SHA-256: 469b1a8d46cbf4ef5b9d423987b37d632013943622938244d025bb41fffd2543
font_02_sfnt_off00014d21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D21 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3