Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f9889d7d6667258…

MALICIOUS

PDF

80.1 KB Created: 2021-03-24 13:13:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a984574ab369053183e8ac6153b7987 SHA-1: 8ea937e87a568f68455ec3d30343f0f00e4aa462 SHA-256: 4f9889d7d66672583f6bbc740f0135a6c91b9b5b493bd0c1ab3c022841c3876a
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a link farm, indicating a large number of external links. One of these links, 'https://pelibifir.ru/strik?utm_term=are+my+feelings+for+him+real', is flagged as unknown reputation and is likely part of a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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=are+my+feelings+for+him+real
    • https://cdn.sqhk.co/pixukinoma/gjjauoX/89026348251.pdf
    • https://cdn.sqhk.co/xafeperale/ifSgcrc/24959139.pdf
    • https://cdn.sqhk.co/donewipimep/ifjj1ok/archicad_21_crack_mac.pdf
    • https://cdn.sqhk.co/puxolika/a5bHgf3/domino_tricks_tutorial.pdf
    • https://cdn.sqhk.co/jolodovi/gShgzhf/bitmoji_for_chrome_login.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cccd2283-d272-450a-840b-6541230ebad2.filesusr.com/ugd/5de1df_24f16d4914bd4faea9bfbb141dc45ee0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/18dd0431-5c3e-4ef3-bc7f-1eeb4ae838af/can_we_use_pendrive_in_set_top_box.pdf
    • https://uploads.strikinglycdn.com/files/a2d4ee16-c564-4d8b-9acd-80c04e3bfa06/diablo_3_necromancer_pestilence_build_season_18.pdf
    • https://uploads.strikinglycdn.com/files/297c7c9c-1502-4193-b4b8-bb7d7787fccc/46131047560.pdf
    • https://s3.amazonaws.com/latufenaw/monanotixikem.pdf
    • https://uploads.strikinglycdn.com/files/1fc7431d-83b6-414b-a7b7-39f40f73cc74/primeros_auxilios_kit.pdf
    • https://30de3caf-c510-4ce9-8691-b8280dc60d9b.filesusr.com/ugd/4980ee_03a786e73cd34b6ca370d475e3aed706.pdf?index=true
    • https://uploads.strikinglycdn.com/files/81bae932-71b8-4d35-bb27-e9ed0004aad3/virekedeza.pdf
    • https://s3.amazonaws.com/bawalidamovidud/oxford_mini_dictionary_for_java.pdf
    • https://uploads.strikinglycdn.com/files/2d255d8a-5e02-4863-817c-fa6c81cf212a/rupuva.pdf
    • https://ab25a8b3-4d80-4d4b-93a1-c1347014fa7c.filesusr.com/ugd/8d0191_7c274ee519f343ada7e0da72e0da3962.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b16bd0c8-c0d8-4a54-86a8-6381f272ff3c/how_to_develop_technical_writing_skills.pdf
    • https://s3.amazonaws.com/gofilafixu/wofovumipo.pdf
    • https://uploads.strikinglycdn.com/files/6e112ff1-9eb7-4b8b-9c44-3276caf90def/17576565164.pdf
    • https://s3.amazonaws.com/dazifozixawus/asphalt_8_for_pc_filehippo.pdf
    • https://297de083-771a-4730-a3b8-a2afe8c7d209.filesusr.com/ugd/47424f_1cc3859f98f54c158df868d8ea92774c.pdf?index=true
    • https://s3.amazonaws.com/rebomedug/sekinisejivi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efae.bin
00f45e96474f6107e0b4157b328067b3cd445c2b9c7fae39985615f49b6772d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAE 4980 bytes
font_01_sfnt_off00010067.bin
6978854ad8ca6f0fe20c7eebf3d9bd7d4f91129be93e8b090d8792d05f5ffed4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10067 10784 bytes
font_02_sfnt_off00012515.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12515 4324 bytes

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