Malicious PDF — malware analysis report

Static analysis result for SHA-256 a76d840d2efa6863…

MALICIOUS

PDF

76.4 KB Created: 2021-03-25 19:31:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e219a881aa51f2f487c1367193e6849 SHA-1: 87b894aee98420222ba6ed90b2af18608ed7db40 SHA-256: a76d840d2efa686382bb145577dea4f16bf4b631c7c2fc532bad61558aeec927
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 large number of external links, with one pointing to a URL that appears to be part of a link farm designed to manipulate search engine results. The document body, though heavily corrupted, contains a title suggesting a lure for users to visit external 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://dafemum.ru/strik?utm_term=how+to+remove+black+pimple+marks+at+home
    • http://wumomotetidofe.getenjoyment.net/videos_de_verbos_en_ingles_para_nios.pdf
    • http://sawemawe.mywebcommunity.org/cours_algorithme_et_programmation_pascal.pdf
    • http://fejekadiwoxobiz.getenjoyment.net/goxuvunagugezixatetevoru.pdf
    • http://ruguwafe.scienceontheweb.net/forex_for_beginners_youtube.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fogusevo.epizy.com/flammable_compressed_gas_storage_requirements.pdf
    • https://uploads.strikinglycdn.com/files/004ad3ce-c315-4cd4-ae44-c473bfbf34ae/how_do_you_explain_symbolism.pdf
    • https://s3.amazonaws.com/kufazete/44387622122.pdf
    • https://uploads.strikinglycdn.com/files/0cab0c0b-b640-4bc8-aa1e-1b001299a9dc/34206870945.pdf
    • https://uploads.strikinglycdn.com/files/15f93dd6-5459-4f20-ad13-aa5945413ebf/what_is_satire_in_animal_farm.pdf
    • https://0e01c86c-6ad9-43de-bc04-b8819f410213.filesusr.com/ugd/73c254_5a56bde60a5e4353af41c8b87c2897aa.pdf?index=true
    • https://24d1f61b-f5c5-4d2f-8180-62589f44e8d8.filesusr.com/ugd/eed56f_3467aa86b4d6478980f3c91de7827f81.pdf?index=true
    • https://s3.amazonaws.com/topipovikapari/new_love_music_ringtones.pdf
    • http://tirinito.epizy.com/sig_sauer_p226rx_holster.pdf
    • http://kadoxosin.atwebpages.com/xumapokigelafusewuv.pdf
    • https://uploads.strikinglycdn.com/files/361238c2-3edd-4c0a-afa6-d89d153348f0/12195971723.pdf
    • https://s3.amazonaws.com/nafoxuda/mikobejitovukobonaxon.pdf
    • https://920f4c01-5fd6-4c40-8b27-b99972fecb60.filesusr.com/ugd/d63aaf_c26d1c60daca466fbc5111d153ccca62.pdf?index=true
    • https://s3.amazonaws.com/telasebisu/85330921360.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_off0000eb5c.bin
fde5776b49d0a7d09e01a469222a1b4cbc1c3106d73f7e470e67c0b4d822ce05		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5C 5492 bytes
font_01_sfnt_off0000fdee.bin
587e0e37d5b5cb4c008166b1370381f46355bcf9d150adae7aed4082b400e100		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEE 11308 bytes

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