Malicious PDF — malware analysis report

Static analysis result for SHA-256 794fb580e70efb8c…

MALICIOUS

PDF

76.4 KB Created: 2021-03-30 22:19:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 32360d456935362b4c368c391ea51f02 SHA-1: 59ea35876725df951f1702a08f2a2bd9c6f499e7 SHA-256: 794fb580e70efb8c57ba3ccc765c410191a0f6e893f685efd53f2b8116463911
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 5

  • 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 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://baarspo.ru/strik?utm_term=siemens+signia+hearing+aids+app PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4456391/normal_5fd80989eb9ef.pdfIn PDF document text
    • https://feraresafobigim.weebly.com/uploads/1/3/0/8/130813798/ce47cc4b7006730.pdfIn PDF document text
    • http://meetchambre.xyz/88712275802n1hin.pdfIn PDF document text
    • http://a1metromovers.com/25024001796zfpfa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454184/normal_5fd93c7888a2f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381108/normal_5ff852a9c6d22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419818/normal_60346823dd493.pdfIn PDF document text
    • http://bnl-jobs.com/25525420012wesey.pdfIn PDF document text
    • http://form-lnstagramverifiedbadges.com/how_to_use_a_barnett_jackal_crossbow4a4sr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421213/normal_5fe18cf7c681b.pdfIn PDF document text
    • https://nixunirebexif.weebly.com/uploads/1/3/0/7/130776125/68141fcf7ea.pdfIn PDF document text
    • http://sugameloxufe.mywebcommunity.org/should_i_go_to_disney_world_in_january.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465147/normal_60624086a19dd.pdfIn PDF document text
    • http://masito.space/pillars_of_the_earth_tv_series_streamingpckug.pdfIn PDF document text
    • http://soferijivav.getenjoyment.net/kufuwufo.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/kavalukato/87880252270.pdfIn PDF document text
    • https://s3.amazonaws.com/lolaritemukole/5404450929.pdfIn PDF document text
    • https://s3.amazonaws.com/jitimesolagun/gapebifowozajajuzut.pdfIn PDF document text
    • http://rodedewezijore.atwebpages.com/microsoft_excel_projects_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/gogunabones/leon_orthographe_cm2.pdfIn PDF document text
    • https://s3.amazonaws.com/xaliwalufoguni/science_fiction_books_free.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_off0000ee42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE42 5444 bytes
SHA-256: be3fa1251dadf376aaa09042e715e2fd12607a12ee7f74d88a35ff300f4fa0c8
font_01_sfnt_off00010093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10093 10436 bytes
SHA-256: 37f8e89297e054dbb02c6d5c146cb7edc32b510fa6280f68cc3017e7be06bd46

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