Malicious PDF — malware analysis report

Static analysis result for SHA-256 71d30ddcf8a63896…

MALICIOUS

PDF

75.2 KB Created: 2021-06-13 17:29:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: b1711f353b67ca8539e9a2ddaa03131e SHA-1: 1a03857bfdfa8cdfadd3f6f150f914c07665db71 SHA-256: 71d30ddcf8a63896265a4391dd8d220af91ad1a4510a8569b7907ed3768609ab
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 0.9997

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://pistant.ru/pbw?utm_term=bossa+nova+chords+pdf PDF link annotation
    • https://lidafuxabu.weebly.com/uploads/1/3/4/8/134891514/radegibolan.pdfIn PDF document text
    • https://kuvobawodamelis.weebly.com/uploads/1/3/5/3/135350379/80cebb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383137/normal_5fc6c96562e63.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462059/normal_602e287b52a28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412396/normal_60bbe72cc8505.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372983/normal_600ead57a6c5c.pdfIn PDF document text
    • https://zerebutaravuna.weebly.com/uploads/1/3/5/9/135965874/8e14a96.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426820/normal_5feb27b0288ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497071/normal_603e48d7e2c19.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443617/normal_5fcdfc215de8e.pdfIn PDF document text
    • https://vavuwujaxozu.weebly.com/uploads/1/3/1/0/131070334/4e4eb0.pdfIn PDF document text
    • https://kekixulup.weebly.com/uploads/1/3/1/4/131407102/fusuburuvitejupepoda.pdfIn PDF document text
    • https://nimaxinamupun.weebly.com/uploads/1/3/4/6/134635612/nedoka-zozevefalonu.pdfIn PDF document text
    • https://gunimumatepatu.weebly.com/uploads/1/3/5/3/135313318/4716911.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454681/normal_5ff2282f92800.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tereburokofe.pbworks.com/w/file/fetch/145137177/45593409424.pdfIn PDF document text
    • http://kukumepubop.pbworks.com/w/file/fetch/145157007/croods_new_age_watch_free.pdfIn PDF document text
    • http://xorunezagu.pbworks.com/f/uc_browser_for_pc_windows_8.1_free_download_64_bit.pdfIn PDF document text
    • http://vowetegaperi.pbworks.com/w/file/fetch/145229568/download_scouts_guide_to_the_zombie_apocalypse_full_movie.pdfIn PDF document text
    • http://bevojoluvu.pbworks.com/w/file/fetch/144471747/73068283115.pdfIn PDF document text
    • http://fudejob.pbworks.com/w/file/fetch/144732360/78270443535.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_off0000e63b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63B 5320 bytes
SHA-256: 95aba74028dd50ac11081bcbc69b5a2c65a48c1f14eb928f2cc4198bf79a89db
font_01_sfnt_off0000f85a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85A 11200 bytes
SHA-256: c3b10983d12c7c06f55bbb60211332410c49ef0c6b176116845f54f0d1ec1940

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