Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9c75c08c44fec73…

MALICIOUS

PDF

77.2 KB Created: 2021-03-18 06:53:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 941e078efccde0eb9509c23f88341eaf SHA-1: 9ccaac0882f7d057cad2f239535e0a80d69ca67b SHA-256: f9c75c08c44fec739fc417b2538fd5062f6d30ebe8fb2dd1b7a4d67ed407edc4
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 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dugedepap.ru/wix?keyword=stoichiometry+problem+set+3+answers PDF link annotation
    • http://dommasters.site/787366310714jafa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456712/normal_60053c3db1839.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417986/normal_5fea3b43b66bd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459322/normal_600911bea7787.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459917/normal_5fdeb30953b1a.pdfIn PDF document text
    • http://okstore.info/aluminium_extrusion_die_designxihg5.pdfIn PDF document text
    • http://fullstacket.online/zijikatenebq3u.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465277/normal_5fd163ac3c104.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/8d60a157-8df6-48fd-b461-0a983d5443e2/dugadewunudizito.pdfIn PDF document text
    • https://s3.amazonaws.com/dutuzanob/indian_flag_3d_live_wallpaper.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da42b8f4-f15e-4597-bae0-ee29da27d186/tixox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69ded714-0a22-4ea6-9262-6a556e9506f2/sesosukosetupugodovita.pdfIn PDF document text
    • https://s3.amazonaws.com/xoguwavosuje/35080428476.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32fcdea0-2b64-433d-926d-dfd42545c99d/98528376648.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa2048f3-3449-493c-b2df-4bad11feaecf/nepotesig.pdfIn PDF document text
    • http://pudofifomabevin.rf.gd/fundamental_of_accounting_book.pdfIn PDF document text
    • http://sajorasuxanuvil.epizy.com/zojave.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_off0000ed03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED03 5776 bytes
SHA-256: e4c3d3d6f26d92b779ad444b12d3bfc908c5d2fc5ceabaef09c9145b7b3479ea
font_01_sfnt_off00010092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10092 11108 bytes
SHA-256: ebc6ce9faeeda7885958fb3607f036b50d0a88f05808557467cbbc5f1e732da4

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