Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a02cca5212272f8…

MALICIOUS

PDF

170.3 KB Created: 2021-03-18 07:18:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: dda9a9c4aeab945c750441d181407fbc SHA-1: 60fd822ff7c058bf7038cb699155edeb7327e68e SHA-256: 4a02cca5212272f88141ee1fdef4401b0eb4b6e688ca0007626f6af750d8a9e4
184 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and it contains links to known malicious redirector infrastructure. The PDF document's structure and embedded links suggest it is designed to lure users to malicious sites, likely for phishing or further payload delivery. While no scripts were explicitly extracted, the nature of the embedded links and the PDF format itself often leverage JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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/wix?keyword=%25D8%25AA%25D9%2581%25D8%25B3%25D9%258A%25D8%25B1+%25D8%25A7%25D9%2584%25D8%25A7%25D8%25AD%25D9%2584%25D8%25A7%25D9%2585+%25D9%2584%25D9%2584%25D8%25A7%25D9%2585%25D8%25A7%25D9%2585+%25D8%25A7%25D9%2584%25D8%25B5%25D8%25A7%25D8%25AF%25D9%2582+pdf+%25D8%25AA%25D8%25AD%25D9%2585%25D9%258A%25D9%2584 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4486351/normal_6014f549bf9e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408180/normal_601603010f154.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366365/normal_5feb23a513895.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420028/normal_601f15a6ee30f.pdfIn PDF document text
    • http://figuzunifowet.iblogger.org/how_to_train_your_dragon_season_2_episode_13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450047/normal_5fe81d48403ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484097/normal_604cc83016e3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459805/normal_60301c3d03fd4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jaraduvexuzufe.epizy.com/68430745847.pdfIn PDF document text
    • https://254b3b0b-79dc-4992-827c-fd4bb3db3178.filesusr.com/ugd/f515ca_3ef870cee84748438642e46685d0814e.pdf?index=trueIn PDF document text
    • https://a2214900-82f6-4ed5-a432-d5ffd14110fa.filesusr.com/ugd/306b6b_bc3f9ebf3686413792da1132b1089318.pdf?index=trueIn PDF document text
    • https://592908bf-dd96-48cc-88d9-ffebbdd10d84.filesusr.com/ugd/f34823_35ca4fc8b41141928803e6c2ed1323e3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/muxepugigitezejonutuga.pdfIn PDF document text
    • https://7e005a1c-fb68-43c1-af83-b854b6a2d282.filesusr.com/ugd/dcfb95_b45e24f32d554f17890fba0b904c062a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/eclipse_juno_java_8.pdfIn PDF document text
    • https://810dce77-56ab-4324-823a-3549757f4eab.filesusr.com/ugd/1fad07_1e6a940f94f24bbb8e8f10041ff2614b.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off00026125.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x26125 31252 bytes
SHA-256: e456300971364fad64c4313610b3491efd05ff674c065a0b628b2349f43d87bf
font_00_sfnt_off00020756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20756 4424 bytes
SHA-256: 2b79dd1b6be00df63ddb56f12636c706c611b15b1850328e9348944e311226e0
font_01_sfnt_off00021670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21670 2176 bytes
SHA-256: 54fa575656634f918238e0159db91e500d6a7c1b4a2db3acca3205de117167ad
font_02_sfnt_off00022089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22089 10416 bytes
SHA-256: 6c0c9c8619c5d33652255cd519a3f2a8aab8bb9cefb57e61a7aacc0a169ae7da
font_03_sfnt_off000244a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x244A3 18352 bytes
SHA-256: 0bc4caca5791a7902d99fd6bfa974dcf18d50db68133f18be55264dd81ba9b66

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