Malicious PDF — malware analysis report

Static analysis result for SHA-256 881da24bf018c9de…

MALICIOUS

PDF

78.7 KB Created: 2020-12-26 04:15:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10e6c434d7df47c59dbb1ef5e56b4eb0 SHA-1: 58493cbe4676d6d731ff20a1f8418fc93ecdd94a SHA-256: 881da24bf018c9ded1eae9d4db600d706862e7bbf99d7421951b43816057e41e
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' pointing to 'https://s3.amazonaws.com/dewutexorob/powogateposit.pdf'. Another heuristic indicates an external URI to 'https://traffking.ru/123?utm_term=db2+interview+questions+tutorialspoint'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffking.ru/123?utm_term=db2+interview+questions+tutorialspoint
    • https://cdn.sqhk.co/vazedibimi/JnFRiiW/beautiful_flower_wallpaper_download_for_mobile.pdf
    • https://luxoxika.weebly.com/uploads/1/3/4/8/134899107/jamawofezugep-gipadefa.pdf
    • https://sobexezawatu.weebly.com/uploads/1/3/4/9/134903145/3c1d9b1b1fbe.pdf
    • https://cdn.sqhk.co/likafupat/jbjeijm/magic_call_voice_changer_app_cracked_apk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/dewutexorob/powogateposit.pdf
    • https://s3.amazonaws.com/farowug/sezufutowuwunop.pdf
    • https://uploads.strikinglycdn.com/files/0f79f3be-4b97-4d99-a819-dfe8e1c04dc4/gunutekumo.pdf
    • https://s3.amazonaws.com/gazivemon/83523442588.pdf
    • https://s3.amazonaws.com/fipijife/10684292708.pdf
    • https://s3.amazonaws.com/paxivogedewilu/begutachtungsleitlinien_zur_kraftfahrereignung.pdf
    • https://s3.amazonaws.com/ronenitevodo/5370176516.pdf
    • https://uploads.strikinglycdn.com/files/4b0a25ba-2c1a-4caf-8e7e-9e6216859cf5/boduwutavakivegoxa.pdf
    • https://uploads.strikinglycdn.com/files/f9057cb8-5991-4dc9-b90e-178ebc4a2515/deutsch_na_klar_6th_edition_download.pdf
    • https://s3.amazonaws.com/bogeguva/google_account_creation_form.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_off0000e971.bin
cdb0f861504eb0e21a87208e0e409c56e878079a8847eb11296a86577a773ec6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE971 5244 bytes
font_01_sfnt_off0000fb64.bin
6892aa790a7a372e81638208a4ac3aa7052006b2fa66538c91b92ff3d6296600		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB64 10708 bytes
font_02_sfnt_off00011fcf.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FCF 4324 bytes

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