Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b10e59a6797449d…

MALICIOUS

PDF

79.1 KB Created: 2021-04-16 11:09:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4978f42a60a269ae1f3dbc43b677e2f1 SHA-1: 1f4c6e1d90752b6751703c868c3147943ea03e58 SHA-256: 8b10e59a6797449d91554a401f802710470cb002aa2536e6462ade517cfc320f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDFs, suggesting a link farm or SEO poisoning tactic. The primary malicious URL identified is 'https://pelibifir.ru/strik?utm_term=happy+endings+movie+review', which is likely used to redirect users to a phishing or malware distribution site. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://pelibifir.ru/strik?utm_term=happy+endings+movie+review
    • https://wofovadorobonam.weebly.com/uploads/1/3/0/7/130739883/kuzep_womemadav.pdf
    • https://tofibuji.weebly.com/uploads/1/3/5/3/135309424/444300.pdf
    • http://famozosivupiwij.sportsontheweb.net/systems_engineering_masters_penn_state.pdf
    • http://mevakimuvu.mypressonline.com/80339278692.pdf
    • https://pemilixip.weebly.com/uploads/1/3/5/3/135330450/keforagixofedafi.pdf
    • https://xizilajonufu.weebly.com/uploads/1/3/4/5/134528384/gilarebozixoguberar.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/da6a6c7a-6431-47d5-8cb5-e648799c9ff7/cub_cadet_lt1045_engine_problems.pdf
    • https://c84d532c-3b33-47d6-96aa-4134a1164eb1.filesusr.com/ugd/6d45f6_9a7996e38549460186507d2540fb82d5.pdf?index=true
    • https://f8e303d0-f350-43d2-b7c3-f886ef13ec25.filesusr.com/ugd/1bb397_48896820f6ea440ca563c2f68967c7e6.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6a196d24-a49a-484b-95e3-3a39f164b5df/acer_aspire_wont_turn_on_unless_plugged_in.pdf
    • https://uploads.strikinglycdn.com/files/2a6cdf59-19c8-4b7a-8fd4-85cfc8ef3a07/pogovukejelekoruxokuwa.pdf
    • https://917ed8d3-8a9f-4c5c-a3ad-554e533308ad.filesusr.com/ugd/a4e402_af377f3221754bb2a0d3208dac2f9a2f.pdf?index=true
    • https://52ed6390-a5c1-4502-9f93-599cf6d98ad1.filesusr.com/ugd/f7fbc8_ce0e34b1c6f549748c67ec5bea2f9574.pdf?index=true
    • https://d8acad56-eb9a-42d1-a06c-a695c5b02328.filesusr.com/ugd/0ad6c7_1552369a60114a22a214a5003fabc3fe.pdf?index=true
    • https://80172413-d145-4b71-b7cf-4a007d76ad29.filesusr.com/ugd/cacfd7_de1eede2a9494c7ca1ef01ea29a78c24.pdf?index=true
    • https://uploads.strikinglycdn.com/files/81537085-9b35-4a39-94a8-394532aafa39/26582206686.pdf
    • https://uploads.strikinglycdn.com/files/cb6d6356-9db5-4ac2-aa87-785eaff53d54/pokanupifus.pdf
    • https://uploads.strikinglycdn.com/files/f3fcc3f7-7478-46ea-85ef-dc1392bce24f/kaossilator_pro_editor_windows.pdf
    • https://a86a6b26-b473-4b55-b9aa-7628a2bff077.filesusr.com/ugd/4f270c_7f1330bf78254701abf5baca75b79465.pdf?index=true
    • https://e0eedba4-cf99-4c42-97f5-d3f9ae5832dd.filesusr.com/ugd/e36ea7_a58907f97e96479cbe5a3ef9b3a0826f.pdf?index=true
    • https://627f215e-41ba-4aa4-9906-5f9f9d117739.filesusr.com/ugd/8ab72e_f326076dc47d42e187d6242be5d843a1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/69789618-5de3-4fe7-9ad4-de57cafcf51e/codigo_de_etica_del_trabajo_social_en_colombia.pdf
    • https://uploads.strikinglycdn.com/files/c3ff126e-b4d1-462d-b21e-7ac43dc0205c/kikumo.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_off0000f6ae.bin
86965268dc0bf31c7ac7e1973ce937f7aa9288abd1e93801a752813132e3db60		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AE 5464 bytes
font_01_sfnt_off00010947.bin
3c80cb8af266da237e7831604dc484b3c64cc76514c1d9a33fd6f65f30a53f4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10947 11212 bytes

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