Malicious PDF — malware analysis report

Static analysis result for SHA-256 c68fb3ea90e248f5…

MALICIOUS

PDF

75.5 KB Created: 2021-03-02 18:04:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9e36b4745b849974cd34b3d4709782e4 SHA-1: 99e4283fd41e9e73d589aacddefa2284d57505b2 SHA-256: c68fb3ea90e248f5cb1ebf5d30607a7ab56b71840861183eedf8d77ee0ad62a3
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 0.9999

Heuristics 5

  • 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 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://jacksth.ru/123?utm_term=panasonic+dmp-bd60+firmware+update PDF link annotation
    • https://fapuwokezisojo.weebly.com/uploads/1/3/1/4/131453853/loriresofutiwun.pdfIn PDF document text
    • https://kebedemozi.weebly.com/uploads/1/3/0/7/130775588/zisiwinabazafemuvum.pdfIn PDF document text
    • https://bakijunida.weebly.com/uploads/1/3/2/6/132695635/2108275dbf.pdfIn PDF document text
    • http://momarivido.mypressonline.com/what_is_the_hardest_sat_practice_test.pdfIn PDF document text
    • http://ideal-it.fun/62261328445ae9n7.pdfIn PDF document text
    • https://cdn.sqhk.co/fopujetoros/zZ5hdjh/85708561492.pdfIn PDF document text
    • http://sadinexiwa.mygamesonline.org/bluedio_t2_plus_turbine_wireless_bluetooth.pdfIn PDF document text
    • https://cdn.sqhk.co/zidexamuwela/h2ifRhb/new_brunswick_wood_carving_competition_and_show.pdfIn PDF document text
    • http://joy-todays.online/a_midsummer_nights_dream_act_three_scene_one_summarydm5hw.pdfIn PDF document text
    • http://vovpomnim.ru/58650997517uwjzl.pdfIn PDF document text
    • https://kixodebu.weebly.com/uploads/1/3/2/6/132682063/7389207.pdfIn PDF document text
    • https://ripodomix.weebly.com/uploads/1/3/0/7/130775876/1554756.pdfIn PDF document text
    • https://cdn.sqhk.co/momujolo/kM5mGjg/7860717437.pdfIn PDF document text
    • http://detonic-official.website/aileron_font_family_freer97xq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426819/normal_602d595d559bf.pdfIn PDF document text
    • http://load-bcp.com/77001517169aoea9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496582/normal_5fe81b8e4d20c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tososite.onlinewebshop.net/welinaredaxivajedatomiti.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_off0000db3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3B 5828 bytes
SHA-256: 36878516f383010a97930da79fc48cbd3818bfbbe43da435d17d28207554e843
font_01_sfnt_off0000ef0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0E 15188 bytes
SHA-256: 07160cc7ca0c2f9ebad424f5e13b06e8fa76dbbb2c18cd34d2f31c32a0f02757

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