Malicious PDF — malware analysis report

Static analysis result for SHA-256 9649679b049b1fa3…

MALICIOUS

PDF

68.1 KB Created: 2021-02-12 08:09:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: e6100601e5b56e005f08f9562b1f9ffc SHA-1: 1d55fb615a0d5d136cf0c7f394f3625276f95039 SHA-256: 9649679b049b1fa39ac0804107ee36f16b72a243f2574ab0bee71d770e8075b9
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs that point to various PDF files, suggesting a link farm or distribution mechanism for malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a spearphishing attachment used to redirect users to further malicious content.

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://bologen.ru/123?utm_term=little+brown+handbook+13th+edition+pdf+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450036/normal_5fe6eadb369fd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417032/normal_5ff336a572c5a.pdfIn PDF document text
    • http://potolkilife.ru/87654073808p5oyx.pdfIn PDF document text
    • https://dalatomim.weebly.com/uploads/1/3/4/3/134344090/8466731.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418786/normal_5fff807aa78dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375528/normal_5fda28e34724c.pdfIn PDF document text
    • https://mabavelege.weebly.com/uploads/1/3/0/7/130775551/1855078.pdfIn PDF document text
    • http://ueuniti.website/helicopter_crash_chernobyl_footage7d6yx.pdfIn PDF document text
    • http://gikisivota.iblogger.org/pakejofaxon.pdfIn PDF document text
    • https://fixupikavejezop.weebly.com/uploads/1/3/4/3/134392539/revusixorosanubozeni.pdfIn PDF document text
    • http://razvivatel.blog/91100613516w0nw8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393637/normal_6013f02ab7b14.pdfIn PDF document text
    • http://mazanatur.space/nilsson_riedel_electric_circuits_9thxr1iz.pdfIn PDF document text
    • http://straponartist.com/alethea_group_disinformationmuxde.pdfIn PDF document text
    • https://juxeduwabup.weebly.com/uploads/1/3/0/7/130775558/zukirumezumawi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zoniguzetixan.epizy.com/implosion_never_lose_hope_android_1.pdfIn PDF document text
    • http://wekameti.rf.gd/73774343224.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_off0000cb7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB7B 5404 bytes
SHA-256: 3964169da0ef498418c7785d0a1f6866bdf126c52d18b83f8fc71bbdf92fe630
font_01_sfnt_off0000ddef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEF 10852 bytes
SHA-256: 9e78e459286a7e116deb3ea3c1d98a88a141253b6d0427d3cc5375cd67ca7691

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