Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b0e8e76d7704884…

MALICIOUS

PDF

71.2 KB Created: 2021-03-14 20:01:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: adaa9627b379b6cc47d6f841fa7e48ce SHA-1: eceec0c26a60ab72059d663e6d6b6751da63385e SHA-256: 9b0e8e76d770488454ed01772b04850e9b0d2f23cccb56066ed95a6dcd6a9958
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains a significant number of external links, with the heuristic 'PDF_SEO_LINK_FARM' specifically identifying a mass external PDF link farm. The embedded URLs, such as https://mezovuduw.ru/strik?utm_term=rca+executive+series+phone, likely serve as lures to malicious sites.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mezovuduw.ru/strik?utm_term=rca+executive+series+phone
    • http://scoretdho.best/genie_powerlift_900_parts_listdrrm2.pdf
    • http://digitalmicroteter.xyz/42316393313cna2b.pdf
    • https://cdn.sqhk.co/jimumakevaji/iiKy6XJ/9049465727.pdf
    • http://dezlice.ru/undertale_souls_colorsgn8p7.pdf
    • http://shtancircul.site/how_to_pair_a_bluetooth_keyboard_to_macdn988.pdf
    • http://liketime.online/xelamadofofododurobupobum0gi.pdf
    • http://uspehdnyaaxyz.xyz/how_to_get_rid_of_directions_hair_dyee50jc.pdf
    • https://cdn.sqhk.co/porosobof/jT8ghjg/64376738044.pdf
    • http://50offshop.info/tuvukebutusuwixamonudik07bz.pdf
    • http://tranquils.space/how_to_use_bible_hub_appws49w.pdf
    • https://cdn.sqhk.co/moserusoba/mSHgdQu/free_online_games_for_girlsgogames.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e8ab3a42-13d5-4b63-8282-fa476f5c11e5/29127150699.pdf
    • https://uploads.strikinglycdn.com/files/89ba14b4-0cc5-47d0-98ed-7f679db4cc70/what_are_phobias_examples.pdf
    • https://uploads.strikinglycdn.com/files/e711b5c7-45b4-42b3-a036-5799f75f452c/relulidejememakotekalat.pdf
    • https://6f1239e7-da96-47bf-8adb-22d47a96a9da.filesusr.com/ugd/bb5a15_ab8b37779e4b4b5894e61941e45f7009.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1073281f-68da-4fc1-abda-7c420c865201/how_much_does_it_cost_to_change_to_a_tankless_water_heater.pdf
    • https://425e2ee7-996f-4c6d-a593-b44a2a39b733.filesusr.com/ugd/bb05c1_805e7dd560a44fce80abe0ca005c20e8.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1a155ebd-0df4-4b96-9b52-542e286bb3ee/gif_bill_and_ted.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_off0000da50.bin
2ea21f2353cd97dd0621c2ba50cc57323efb1f3baf97691797d24633dea1a2f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA50 5124 bytes
font_01_sfnt_off0000ebc4.bin
ade153c97f5de229059fc600d0d6363a987632ebcd5cc11ea640fe59090e3a51		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC4 10540 bytes

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