Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d76366eaa83b2a1…

MALICIOUS

PDF

82.4 KB Created: 2021-06-07 01:03:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 939fa534f8aa3a17f95aeee55868bd09 SHA-1: ce609a4618b19c16d51d4a5dbe700b1aedc05ad6 SHA-256: 8d76366eaa83b2a14dcdbadcb99cf7a289c79b4a2542ff70021d0c12fb529146
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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 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/123?utm_term=movie+alif+lam+mim+mp4 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4403120/normal_5fda1f827e6da.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387581/normal_5fdf91590dbb4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474739/normal_600e413dcabe3.pdfIn PDF document text
    • https://rinuwunebod.weebly.com/uploads/1/3/4/7/134750090/nofujefomagelux-lezowodisudivid-jetidir-meneliwizugun.pdfIn PDF document text
    • https://guvoladedesu.weebly.com/uploads/1/3/1/4/131453897/b1d7cbb8e8d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413242/normal_5ffd82051768a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449987/normal_60292b0533028.pdfIn PDF document text
    • https://sozivutapadonen.weebly.com/uploads/1/3/1/1/131164462/situwitavigi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479254/normal_6013b93ed9e49.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468563/normal_6002c71876f7c.pdfIn PDF document text
    • https://suxewanevot.weebly.com/uploads/1/3/4/5/134595646/6278660.pdfIn PDF document text
    • https://naxibanumudu.weebly.com/uploads/1/3/7/5/137516291/rokixomeb-sirimide-gekekaruxixux-genur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392651/normal_603396e7d4dfb.pdfIn PDF document text
    • https://sazisibibufesu.weebly.com/uploads/1/3/4/3/134339611/rumigoratuwin_litapawabojitux.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zizovitunex.pbworks.com/f/can_drinking_old_urine_kill_you.pdfIn PDF document text
    • http://kemususi.pbworks.com/w/file/fetch/144753165/is_bealls_outlet_still_open.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2F 4924 bytes
SHA-256: d88978ff71f57844d0ed25e62ce8d5590e1daf1ceef280794cd25742e8d70b3e
font_01_sfnt_off0000fd02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD02 10692 bytes
SHA-256: bcfecc6c848c30d40732e34fd205aa7cc93e3627733ce452fe25111e64714524
font_02_sfnt_off00012140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12140 17500 bytes
SHA-256: 3b5cb10ece6986fa210fd43fe5f11ff6a75f1379bfe52de3c49c68598512bc70

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