Malicious PDF — malware analysis report

Static analysis result for SHA-256 c24710665d77f183…

MALICIOUS

PDF

75.7 KB Created: 2021-03-31 17:35:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: cd27d180282fa20219d39556d4cf3d1d SHA-1: e7ba55993e42af5a3a1502a61dd54160a8ec0eb4 SHA-256: c24710665d77f183279e4f408945c56247e071065b6cdf2ae44cd95f17dad578
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by multiple heuristics and an ML classifier, indicating a phishing or trojan payload. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The primary malicious URL identified is https://mezovuduw.ru/award?keyword=fire+bible+esv+pdf.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://mezovuduw.ru/award?keyword=fire+bible+esv+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4443804/normal_6049bd6fb9423.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365583/normal_604695127effa.pdfIn PDF document text
    • https://cdn.sqhk.co/vifutetax/5ljdjjZ/24438938440.pdfIn PDF document text
    • https://cdn.sqhk.co/jokawefezo/wjcJLji/hidden_escape_lost_temple_walkthrough_lock_pick.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467038/normal_604fa77e59297.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456135/normal_5fce5f52d37f9.pdfIn PDF document text
    • https://cdn.sqhk.co/jirudumom/kWgjqsu/31426372260.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480755/normal_604355a5b2c55.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/15ce4769-74ab-4635-8ab4-447c63ab4d4a/4027381756.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/322ea2a0-2d32-4a02-bd5d-20f9d4527169/lifijixotamekarimu.pdfIn PDF document text
    • https://aa4c2489-c93b-4667-afab-104bf5323bad.filesusr.com/ugd/8b49c6_f84035365d96479a96e8ccbf6a330f1b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6eb20921-b89e-421a-8f51-17843b2b4c56/how_to_clean_a_vax_dual_power_carpet_cleaner_after_use.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a67770b7-9767-4cf6-9044-186ef9a8e3cb/mens_roman_tunic_pattern.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b44ce79-8a03-48d7-bfae-2cf0d483d161/90593891424.pdfIn PDF document text
    • https://ed7c5604-ec0f-4ae6-9d22-6d534b57d154.filesusr.com/ugd/1d5a3f_5a9fbfd92e464abebe2089a6866751e9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e900815-c81f-42c6-8982-f4ae52c02cb1/vamitunojopuxabaxo.pdfIn PDF document text
    • https://d5bea983-5bca-41ba-aae6-6b688785cc77.filesusr.com/ugd/9ec29b_fa3642f7c9d447cab4d2138b68848240.pdf?index=trueIn PDF document text
    • https://46c0acaa-de7d-4f46-84f0-c2cf1d8ff7d9.filesusr.com/ugd/ac1638_83850daefa0744519a7bc49d8f698c89.pdf?index=trueIn PDF document text
    • https://22fea36a-5e19-4af1-b4aa-fe6e1efe0ee9.filesusr.com/ugd/b5a188_de6c456bb2ac4e9dacb919306ff57a65.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/88c6bffa-f19e-40ef-8cfd-3e182448a99d/vatanigipedavepoji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20a5b623-356a-4cec-aa5a-3662d7a6a945/carb_count_taco_bell_chicken_quesadilla.pdfIn PDF document text
    • https://711a90e7-97f2-4eab-8690-3003ec1e9b64.filesusr.com/ugd/a0905b_86104694693c4d718c41919dbe3fc968.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_off0000ec42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC42 4980 bytes
SHA-256: 074f6bffc86bf16d59522ad331dd8d44b5ea7e9b315c0be107bda668467edb23
font_01_sfnt_off0000fd43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD43 10244 bytes
SHA-256: 5d23567a4b49af269ae861d41e9eabc10ecd51f07f2f3e4eeeaef81d127e856e