Malicious PDF — malware analysis report

Static analysis result for SHA-256 085bb7fecbdc53ef…

MALICIOUS

PDF

80.5 KB Created: 2021-06-01 19:05:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d5b4f3f28f651d1b53f029eef82e897 SHA-1: e0e9f3873db41287714f7d9719f6977c14a928ee SHA-256: 085bb7fecbdc53efb8a483f0b35edd1d6f373d5d6c8620fe2fa69825cec358d4
156 Risk Score

Malware Insights

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

The PDF document was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm with numerous external PDF links. The heuristic PDF_SEO_LINK_FARM specifically indicates a mass of external PDF links, suggesting an attempt to manipulate search engine results or distribute further malicious content. While no scripts were extracted, the sheer volume of outbound links points towards a malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://static.s123-cdn-static.com/uploads/4464852/normal_5ffac3af9703b.pdf
    • https://zetidepip.weebly.com/uploads/1/3/4/4/134432407/bowepani_jimemuk_pubix_xarevelilin.pdf
    • https://kuzikumivinoli.weebly.com/uploads/1/3/4/2/134235757/misezu-refideguxiniwi-jerojedu-jusigigatekek.pdf
    • https://wasexakenisopi.weebly.com/uploads/1/3/5/9/135982815/xosedudim_fejeda_labojitupa.pdf
    • https://cdn-cms.f-static.net/uploads/4386335/normal_6058ccef1c40e.pdf
    • https://jewefero.weebly.com/uploads/1/3/1/3/131383264/vogizez-badodofumulan.pdf
    • https://cdn-cms.f-static.net/uploads/4425504/normal_604101f49d5ee.pdf
    • https://jeporifitev.weebly.com/uploads/1/3/4/2/134265357/japepuvolosejex_novaso.pdf
    • https://fotelixufigowex.weebly.com/uploads/1/3/1/0/131071188/42330.pdf
    • https://kalaxokesipak.weebly.com/uploads/1/3/4/8/134888683/kebogijujizugike.pdf
    • https://cdn-cms.f-static.net/uploads/4373526/normal_5fdb671854dbd.pdf
    • https://vejurinunabesud.weebly.com/uploads/1/3/4/7/134705678/9c7f8d604638.pdf
    • https://zimuvudiredefux.weebly.com/uploads/1/3/2/7/132710782/4b32573ec9691.pdf
    • https://cdn-cms.f-static.net/uploads/4464739/normal_5fd6492feb7f6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://feedproxy.google.com/~r/wb/ENAH/~3/KjdSuPfhPRY/wb?keyword=list%20of%20formal%20and%20informal%20words%20in%20english%20pdf
    • http://vosebim.pbworks.com/f/lincoln_140_mig_gas_settings.pdf
    • https://uploads.strikinglycdn.com/files/1bffd867-f1d8-41a8-8228-e9129c10c2e6/lefizet.pdf
    • http://tisowowuduwe.pbworks.com/w/file/fetch/144424236/can_you_lock_specific_cells_in_google_sheets.pdf
    • https://uploads.strikinglycdn.com/files/2e2d9f46-dd4b-4e88-9ac8-b1f0d2c08396/what_is_the_significance_of_mapp_v_ohio.pdf
    • https://uploads.strikinglycdn.com/files/56138272-16ae-403d-a759-42ecb5100e76/short_summary_of_the_story_the_adventures_of_tom_sawyer.pdf
    • https://uploads.strikinglycdn.com/files/b4f15af1-bee2-4a9d-99ba-6b3e1c503cb0/rimup.pdf
    • http://taxexuwej.pbworks.com/f/tony_buzan_hzl_okuma_yorumlar.pdf
    • http://nikekuva.pbworks.com/f/how_do_i_retrieve_a_deleted_voice_memo_on_iphone_6.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcfa.bin
b58654f7148f79faec9d00a783d025e501a08f94231700866b0c123fa1ab2137		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFA 5488 bytes
font_01_sfnt_off00010f8d.bin
6e5cf11bf80436584b461332d71483b5b20ee7e33d64857fa42f97400b8d7ce6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F8D 10844 bytes

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