Malicious PDF — malware analysis report

Static analysis result for SHA-256 81c240e00ab8c035…

MALICIOUS

PDF

69.0 KB Created: 2021-02-03 02:28:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: c07e88cc2821c29150718c362ed0a06c SHA-1: ed3f339ae2f0c57ec42034ff41c4fa06df612508 SHA-256: 81c240e00ab8c0356bbfd20fbde21d549dcc9119ff363c014032476dfa2df245
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains and hosted on services like Weebly, indicating a link farm. This is often used for SEO manipulation or to distribute further malicious content. ClamAV detected this as Pdf.Phishing.Trojan, and ML classification strongly suggests maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://jacksth.ru/aws?utm_term=beginning+spanish+phrases+worksheet PDF link annotation
    • http://fbcopyright-center.com/algebra_nation_workbook_answers_section_1dv05m.pdfIn PDF document text
    • https://rajuvafawomok.weebly.com/uploads/1/3/4/4/134455823/b2ef023f.pdfIn PDF document text
    • https://kalaxokesipak.weebly.com/uploads/1/3/4/8/134888683/7437322.pdfIn PDF document text
    • https://baxukeze.weebly.com/uploads/1/3/0/8/130874478/4188517.pdfIn PDF document text
    • https://kodidorimo.weebly.com/uploads/1/3/1/3/131380292/c9ed8da1d83.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373240/normal_5fedc242e5e38.pdfIn PDF document text
    • https://cdn.sqhk.co/vipujitebiki/4jphhgh/94204517489.pdfIn PDF document text
    • http://winoraama.site/99987787621c2xps.pdfIn PDF document text
    • https://tazuwadafif.weebly.com/uploads/1/3/4/8/134857375/9555149.pdfIn PDF document text
    • https://digokevun.weebly.com/uploads/1/3/4/7/134747151/pixakerulozo.pdfIn PDF document text
    • http://palitra-cveta.ru/70290766966jtl4u.pdfIn PDF document text
    • http://smcjd.com/47520382221s16xh.pdfIn PDF document text
    • https://cdn.sqhk.co/zanemulazif/dhcR1ij/curse_of_the_werewolves_game_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367625/normal_600a553acdeca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495696/normal_6017bce296f61.pdfIn PDF document text
    • http://sberpodarok2020.online/319012360353s60k.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tetenifeme/73617404218.pdfIn PDF document text
    • https://s3.amazonaws.com/tonemakopinibem/oxford_bookworms_library_stage_3_frankenstein.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_off0000d200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD200 5256 bytes
SHA-256: c7812c622d80532557ad7a1dbe35ba2cc2786e57b0068ad7841c2af6a6bb66b7
font_01_sfnt_off0000e3f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F3 10220 bytes
SHA-256: bbfcd4b5e5eced08cc51986dd19705e34aa023266cfcb6ba6c611be06f25b95b

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