Malicious PDF — malware analysis report

Static analysis result for SHA-256 21ee23e6d0d57835…

MALICIOUS

PDF

83.8 KB Created: 2021-03-18 15:42:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a1ffc77fb918ffdf1f362638ec681dce SHA-1: e994bfe4f742b11bf6d75b18f6b2309669badc39 SHA-256: 21ee23e6d0d57835c67f49130374a897f832d93a99af99d4d11a1e1eb017424a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, and is flagged by ClamAV as Pdf.Phishing.Trojan. The document body, though heavily obfuscated, suggests a lure related to economics presentations. The presence of numerous external URLs indicates an attempt to redirect the user to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://ponafet.ru/strik?utm_term=short+run+and+long+run+cost+curves+in+economics+ppt
    • https://cdn.sqhk.co/dawadetugas/jg5qPS1/vafubodife.pdf
    • https://momigetufi.weebly.com/uploads/1/3/4/8/134876151/9988507.pdf
    • https://cdn.sqhk.co/zokelofid/XsfKpYD/41482624227.pdf
    • http://stixlife.info/great_resume_templates_wordpegtd.pdf
    • https://gixinizolovuz.weebly.com/uploads/1/3/5/3/135348456/9360579.pdf
    • https://cdn.sqhk.co/pirujezexod/2oefnuu/21466623507.pdf
    • http://socialwave.me/what_is_the_meaning_of_the_name_mowgli9333h.pdf
    • https://cdn.sqhk.co/rubuxupab/jiEibKu/turbo_car_traffic_racing_game_download_uptodown.pdf
    • https://cdn.sqhk.co/fegadosijete/7uidcgi/saxexasajaz.pdf
    • http://iglivesupportteam.com/nimosetopisuludazexab4tevk.pdf
    • https://rijevolokawuja.weebly.com/uploads/1/3/4/6/134661742/76394.pdf
    • https://cdn.sqhk.co/miloniwuwave/ghhidPv/can_killer_whales_kill_sharks.pdf
    • http://vodoroding.info/jopirusudejedolevigodie4bzc.pdf
    • https://cdn.sqhk.co/pekotegafod/djjeijo/zavabaxemofukuf.pdf
    • http://rimka.xyz/how_to_calculate_endurance_strengthe4m54.pdf
    • https://cdn.sqhk.co/jefapukawore/gfgihhc/63724984927.pdf
    • https://cdn.sqhk.co/pozuwifofub/ijir0he/zegikajimuj.pdf
    • https://jerexibim.weebly.com/uploads/1/3/4/6/134654770/lepavebot.pdf
    • https://cdn.sqhk.co/kepigofunet/8gdHRid/candy_smash_mobile_game_download.pdf
    • http://palitra-cveta.ru/37471593686q9r1l.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/65329ec4-80e2-43eb-bdaa-fd1fe2bc3ee6/first_alert_manufacture_date.pdf
    • https://uploads.strikinglycdn.com/files/b58a7f92-5a4a-4997-9e44-b04c50fd7808/d-link_dcs-932l_factory_reset.pdf
    • https://uploads.strikinglycdn.com/files/fe4e664a-5858-4a26-bf49-de9a4cbf3589/2012_jeep_grand_cherokee_service_intervals.pdf
    • https://uploads.strikinglycdn.com/files/210dc9a8-cf37-4dc7-8113-959d36a74c1c/optiplex_790_processor_upgrade.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_off0000f824.bin
d2e462cdf317d9a60856755e0f9698f9aadd7bc24184b378cf4ec81ece8d2c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF824 5532 bytes
font_01_sfnt_off00010aca.bin
7d1594b61d0e26cf071c6083da9c1af542000ce329161ca16b2c4876518be3a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACA 11308 bytes
font_02_sfnt_off00013146.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13146 4324 bytes

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