Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc9ba9e1d5b840be…

MALICIOUS

PDF

74.9 KB Created: 2021-02-18 16:48:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 883561a5454470ba23fa72b2abf9b1d5 SHA-1: 5138b4519528eecc6550f7f658a3c25f63921916 SHA-256: cc9ba9e1d5b840be3efe34344a8bdf5100631c5eb8afb6fba9562fe12d5c594e
126 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many hosted on disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The document body text is crafted to appear as a search result, likely to trick users into visiting the embedded malicious URLs. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports the phishing and link-farming nature of this document.

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 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://druttle.ru/123?utm_term=how+many+total+languages+are+spoken+in+nepal PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4489734/normal_5fd09fc3f2285.pdfIn PDF document text
    • http://mmeueue.space/23267505187ji5cv.pdfIn PDF document text
    • https://jatufajikovuna.weebly.com/uploads/1/3/4/7/134719937/f03db9.pdfIn PDF document text
    • http://prodson.fun/solution_set_quadratic_equation_calculatoro54rx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464732/normal_5fc917455a41c.pdfIn PDF document text
    • http://milanbeachs.space/3591496487699vgi.pdfIn PDF document text
    • http://gewebud.22web.org/govaf.pdfIn PDF document text
    • https://woziwapimarezex.weebly.com/uploads/1/3/5/4/135400795/031dd02d.pdfIn PDF document text
    • https://nirejabepifu.weebly.com/uploads/1/3/4/2/134266024/subex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385422/normal_5fd288f8a3b63.pdfIn PDF document text
    • http://regvoolkim.website/normas_de_auditoria_generalmente_acew0u65.pdfIn PDF document text
    • http://bepedegikojafeb.22web.org/zibaxikavuliruwatopun.pdfIn PDF document text
    • http://verefdliyvtorogo.xyz/dolor_en_hipocondrio_izquierdop4c9f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417119/normal_5fe58e14bd06f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490133/normal_6003f8f811c8a.pdfIn PDF document text
    • http://get3creditscores.info/mansions_of_madness_2nd_edition_expansions_listuryqf.pdfIn PDF document text
    • http://lnstagram-verifedbadge.com/retaraledamuxm9wqc.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
    • http://bisavosimirot.rf.gd/xaxifopa.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_off0000d8df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DF 5240 bytes
SHA-256: eeca0a672b28455934d1e285297c1f5081ceddce1140227750a1d08896a44f89
font_01_sfnt_off0000eaab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAB 10992 bytes
SHA-256: 20c8b7fa8a2ededcf6283279e2683f0ec8d960863c6eeca0b42b98f1d5fbb389
font_02_sfnt_off0001106e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1106E 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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