Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6902125ebb76ace…

MALICIOUS

PDF

76.4 KB Created: 2021-04-07 02:48:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 0f41b6a1b28b27d8e2d635a2ed103084 SHA-1: d0d8511f1674f622a4697d3ecb67a2f9eff6bf8b SHA-256: e6902125ebb76ace2863112fb2167c062b4b049277eaf595ab20501dbc631960
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links pointing to various domains, many of which appear to be disposable or used for SEO link farming. One critical heuristic indicates these links lead to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=dancing+at+lughnasa+character+descriptions In PDF document text
    • http://lowusonuraku.mygamesonline.org/50006924976.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367281/normal_600f14761dcb0.pdfIn PDF document text
    • http://xukosususif.medianewsonline.com/role_de_l_appareil_de_golgi.pdfIn PDF document text
    • http://kostlike.site/zekoku0vbw2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372723/normal_602d95adba28c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458124/normal_5fe3f00adc424.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419650/normal_605f4512c46bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385436/normal_60517c0a37c8c.pdfIn PDF document text
    • http://kufowawixapiva.sportsontheweb.net/contoh_soal_dan_jawaban_persamaan_dasar_akuntansi.pdfIn PDF document text
    • http://pojapir.mygamesonline.org/rotinugulijolakuzogi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411709/normal_5ffd6e7e9d6c0.pdfIn PDF document text
    • https://nugaridepi.weebly.com/uploads/1/3/4/4/134474671/jokivi-pituwokeliz-madisuwafigemew.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426416/normal_5fde7275939dc.pdfIn PDF document text
    • https://fodoradesak.weebly.com/uploads/1/3/1/4/131454556/dc2b260d.pdfIn PDF document text
    • http://bodyita.space/sifigidekitonotuxexahrkbk.pdfIn PDF document text
    • http://xevusezes.medianewsonline.com/sutiwizi.pdfIn PDF document text
    • http://risumeboze.getenjoyment.net/all_bright_places.pdfIn PDF document text
    • http://baby-slings.ru/usps_return_to_sender_codesbzlh8.pdfIn PDF document text
    • https://gisunotagalaros.weebly.com/uploads/1/3/2/3/132303086/369a046b7404.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sadozejeko.myartsonline.com/10971803393.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_off0000eb83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB83 5332 bytes
SHA-256: b876360742ad1792d800e285fdd56b81f6f068301423a32d4c772cf9ad50802e
font_01_sfnt_off0000fd9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9D 11516 bytes
SHA-256: 160fc560933e072c5656743893822b9f617d37f65510edb111d0d1908fc3ba9f

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