Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef249f5d5816c2d5…

MALICIOUS

PDF

80.8 KB Created: 2021-05-16 14:25:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b47f3fafed22aa9083a64f5dbb8bdcec SHA-1: e64e3355a69e449dad1d58fa4ef01e9b4b379439 SHA-256: ef249f5d5816c2d5dd2f5d47a67789d500e1ba99b0977a324f03593bae903e9d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, many pointing to other PDF files, suggesting a link farm or redirection mechanism. The primary malicious URL identified is https://xajibur.ru/strik?utm_term=500+gr+a+ml+harina, which is likely used to deliver a secondary payload or redirect the user to a phishing site. No scripts were extracted, but the PDF structure itself facilitates the attack.

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://xajibur.ru/strik?utm_term=500+gr+a+ml+harina
    • https://rotarivinevi.weebly.com/uploads/1/3/4/5/134599250/53fe40baa.pdf
    • http://sopafekidis.sportsontheweb.net/3556396733.pdf
    • https://cdn.sqhk.co/soribivevi/gheggie/wezabigefurive.pdf
    • https://noxetetejiv.weebly.com/uploads/1/3/4/3/134391164/5289016.pdf
    • http://lazategomid.scienceontheweb.net/carte_du_monde_complete.pdf
    • https://cdn.sqhk.co/jutafegobexe/yPgjghT/online_mazes_for_5_year_olds.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/metakibeme/89931632092.pdf
    • https://7ae52be2-ba3c-41fb-8935-29281088223e.filesusr.com/ugd/affaa6_e5757e597ba44d8b99ab36a9001dc98e.pdf?index=true
    • https://s3.amazonaws.com/rezugekolaba/bseb_10th_admit_card_2019.pdf
    • https://s3.amazonaws.com/fizufapu/nadim.pdf
    • https://s3.amazonaws.com/sajatesawodiji/how_to_get_time_capsule_in_upper_west_side.pdf
    • https://f9c81679-ddb1-4746-ab40-32673edc426c.filesusr.com/ugd/2eff39_014ed584604e46239a6284a84c97e42a.pdf?index=true
    • https://s3.amazonaws.com/vuliwisuwig/the_huntress_dead_by_daylight_guide.pdf
    • https://8b8c7005-3af0-45a1-8e5b-a6902caa9335.filesusr.com/ugd/dbd7d9_af011ab864b44ce1b75d9e13d6824fb9.pdf?index=true
    • https://s3.amazonaws.com/neporezofov/voxonowabepomividar.pdf
    • https://s3.amazonaws.com/fewifuwu/10894396700.pdf
    • http://furunes.onlinewebshop.net/gagikusezudad.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_off0000ef29.bin
00eec81c258bfc302b5e8257b2001fcae4b1faaad9fd244ae116f51108a1beb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF29 4572 bytes
font_01_sfnt_off0000fe5f.bin
8c8e268a8812d6b5de8e585b18d66013c5b00d08cf966a811f070c17516b0ba3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5F 12324 bytes
font_02_sfnt_off00012658.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12658 4324 bytes

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