Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b751f032749e6d2…

MALICIOUS

PDF

76.6 KB Created: 2021-03-30 20:52:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 1f85250cbf2ec30f37af82ae27081f76 SHA-1: 55612119274c789d8613d225f42ee5f793b7855c SHA-256: 4b751f032749e6d28ce2e055a16ccf29f0ad38efea44a25c7f1df9d4643827e8
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9996

Heuristics 6

  • 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.
  • 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://vilenefex.ru/award?keyword=abortus+komplit+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4478430/normal_5fd779be5f626.pdfIn PDF document text
    • https://jamojibo.weebly.com/uploads/1/3/5/3/135349767/bfde060.pdfIn PDF document text
    • https://xezorilim.weebly.com/uploads/1/3/4/5/134588859/wabokovalujavi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444371/normal_60303ac6eca36.pdfIn PDF document text
    • http://dupamineni.medianewsonline.com/asceticism_and_the_spirit_of_capitalism.pdfIn PDF document text
    • https://vumifedesonuzik.weebly.com/uploads/1/3/4/8/134849268/3054380.pdfIn PDF document text
    • https://jizotigop.weebly.com/uploads/1/3/0/8/130874082/ae6c944e70.pdfIn PDF document text
    • https://bafuzonexive.weebly.com/uploads/1/3/0/7/130739369/7595515.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417313/normal_605162bfb55e8.pdfIn PDF document text
    • http://bejisosubonito.sportsontheweb.net/what_are_the_parts_of_a_faucet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405904/normal_5fe3966c8e97e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0a497e50-07dd-462d-832d-d8678f741a8e.filesusr.com/ugd/5f857b_e4a84fc67ae44305b28790b550f7316c.pdf?index=trueIn PDF document text
    • https://a1c9bafd-2917-4c1b-b79c-a4b44a941470.filesusr.com/ugd/f0f215_8d1fe51b60374957afbb0654adae6e32.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xijuxosisomuna/990938648.pdfIn PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/1757858843.pdfIn PDF document text
    • https://f3b8d348-8566-49c9-a9f8-a2c3b9e1bc8e.filesusr.com/ugd/f1c748_428e0dade75247f3b88e6dbbedeb7ad2.pdf?index=trueIn PDF document text
    • https://2d130471-2a64-48ba-87cf-8f1e86c6acad.filesusr.com/ugd/9c43ec_3834562617344f64b823a582cb599e94.pdf?index=trueIn PDF document text
    • https://3edbbcf3-b5b1-446e-9630-835d38fa79e0.filesusr.com/ugd/6908d7_3553c508428b4989a1dbf73bf56e5fc0.pdf?index=trueIn PDF document text
    • https://19f621d4-ab03-49b5-bf1d-c78de40104d4.filesusr.com/ugd/bc84a3_beef8f4bedc5490fb2794090457990ef.pdf?index=trueIn PDF document text
    • https://288dffde-0386-48bd-adba-b069b5f3b70f.filesusr.com/ugd/7e1b39_2e68f47b93fd402bacfe9d520b31e45e.pdf?index=trueIn PDF document text
    • http://jujobope.atwebpages.com/duvos.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_off0000f054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF054 5168 bytes
SHA-256: 5714a8e967f4074cc0c7837b35dbb32ba9e5633d1b8749f7b894470d0efec1e9
font_01_sfnt_off000101d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D2 10208 bytes
SHA-256: 5f3e416065d4129bb03c7a4bcd97101413623298140a826804614f7e5b3e5773

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