Malicious PDF — malware analysis report

Static analysis result for SHA-256 5389f8fed9f6e4b9…

MALICIOUS

PDF

87.6 KB Created: 2021-04-07 22:06:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b0269dc5fb58b2b478784b1ba5bee8f2 SHA-1: 5a4bbbfdb72287834b1d2457846250e70a262de6 SHA-256: 5389f8fed9f6e4b9d610eea2d5f1322bcaeddffe022a6afcc07346655337f271
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-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://druttle.ru/123?utm_term=high+school+physics+textbook+holt+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450256/normal_6022bd533798c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377125/normal_6040b60b0d072.pdfIn PDF document text
    • http://mudixefibewab.mywebcommunity.org/52941420856.pdfIn PDF document text
    • https://cdn.sqhk.co/balaragu/qihjgbQ/54331836677.pdfIn PDF document text
    • http://wibubalitobidu.22web.org/roku_streaming_stick_price.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380883/normal_600e53ffee391.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368506/normal_605fb63b90dc4.pdfIn PDF document text
    • http://mebovaduzi.mywebcommunity.org/zitetanixo.pdfIn PDF document text
    • http://zugemuvireri.22web.org/48056802520.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445541/normal_6041548c21ed4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402247/normal_5fd32e3e9ff33.pdfIn PDF document text
    • http://rusefogotomik.iblogger.org/steins_gate_routes_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4528260/normal_602d1c8a852ee.pdfIn PDF document text
    • http://zotikarida.medianewsonline.com/numbers_1_100_chart.pdfIn PDF document text
    • https://cdn.sqhk.co/sowojusawepu/gjm2dgf/kindergarten_report_card_comments_behavior.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385850/normal_5fdaf1b8a7382.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426687/normal_5ff9fe5cf0bdc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://df6a9abb-74f3-47e1-b359-fe6d1019da36.filesusr.com/ugd/7921d2_049c352c643d4bbbbe0b5f47318fec33.pdf?index=trueIn PDF document text
    • http://roduzafudi.rf.gd/teponiber.pdfIn PDF document text
    • http://kudetewususitup.rf.gd/game_karne_ke_liye_game_dikhaye.pdfIn PDF document text
    • https://8c77b9b7-c39b-43d6-9406-6086bd2c0f93.filesusr.com/ugd/ee6770_dcd977784bc84c848fd5b9b63de9c95b.pdf?index=trueIn PDF document text
    • https://6593eeda-10fe-4128-810f-cbbc79f0a4f8.filesusr.com/ugd/c0a4bf_0ecde55a31a942f9bb3d0090bb44932f.pdf?index=trueIn 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_off000118d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D6 5448 bytes
SHA-256: 6a84cef545821d15c11a0d83480d1ee90f99431ff409e71c979ebce73247a8c4
font_01_sfnt_off00012b6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B6F 10988 bytes
SHA-256: b0b6e9a0fb843648ee2a2f20b1b3a22d2fab9dcbdae0ec69f0a9d88310a53baf

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