Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdf13a92412f9d79…

MALICIOUS

PDF

96.4 KB Created: 2021-03-23 01:44:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c49cb479acb65f0771a004a9475b1bfb SHA-1: 8495a071986bd5ed8c994d224dfd6781a2c23a04 SHA-256: cdf13a92412f9d798d39f6bb895435be6a6c954d7713c85f4e4ea96eafddf30c
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The document body, though heavily obfuscated, contains references to 'manual' and application names, likely serving as a lure to disguise the malicious nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://resalured.ru/123?utm_term=astell+and+kern+ak100+manual
    • https://cdn.sqhk.co/joxomawezu/igmsjiH/5547625129.pdf
    • https://tulijibukabez.weebly.com/uploads/1/3/0/8/130814483/zodufewuwi_fufomusoletubi_ganaguxaxop_fitejewo.pdf
    • https://cdn.sqhk.co/gotoruzud/agewV33/kitusojujovosib.pdf
    • http://noxogejukebe.mypressonline.com/31663012465.pdf
    • https://cdn.sqhk.co/sozaxejiv/jjjfQic/ifly_gps_review.pdf
    • https://cdn.sqhk.co/segenoliz/jgjcS2P/87444847128.pdf
    • https://tedemikof.weebly.com/uploads/1/3/4/5/134593475/4a79a.pdf
    • https://cdn.sqhk.co/zikegasenar/8jgidgh/76789236478.pdf
    • https://ganuzuvotaju.weebly.com/uploads/1/3/5/3/135304652/df0e329.pdf
    • https://cdn.sqhk.co/minofavazu/gj9jhid/t_mobile_tuesdays_popeyes_code_not_working.pdf
    • https://cdn.sqhk.co/xarobumevux/shbgia8/kaiser_covid_testing_san_diego_hours.pdf
    • https://fomilapemarujan.weebly.com/uploads/1/3/0/8/130814088/61d9e284b.pdf
    • http://loneresel.mygamesonline.org/how_to_know_someone_check_my_facebook_profile.pdf
    • https://balimalovi.weebly.com/uploads/1/3/2/7/132710770/1734775.pdf
    • https://cdn.sqhk.co/sowumavag/Xzhjjdv/76210331473.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://2b075577-062e-477b-ba44-a680027dca12.filesusr.com/ugd/ee943f_0ea6dc06ab37454db7a79a5f02b9b3ba.pdf?index=true
    • http://kojuvurapamox.myartsonline.com/where_to_buy_blood_pressure_cuffs.pdf
    • http://wuragumok.atwebpages.com/teaching_reading_and_writing_for_young_learners.pdf
    • https://4328a374-8b5c-4134-9cef-e132ca5fc89d.filesusr.com/ugd/6732b1_a009f7d0fcd3441e94e7d7c00685ad8a.pdf?index=true
    • https://8dfdba76-182f-4dc4-9dda-37a8c8d09dc9.filesusr.com/ugd/4ae4db_fa428c2bca2844cc873081296cce35ef.pdf?index=true
    • http://ladurabazidema.onlinewebshop.net/ap_calculus_ab_derivatives_test.pdf
    • https://86146b48-cf95-488a-b5a0-22832f4589a6.filesusr.com/ugd/3b4eee_c9e837d43d734dc3a622e11296328d2b.pdf?index=true
    • http://moxuzaridob.onlinewebshop.net/bosque_tropical_humedo.pdf
    • https://a50dbba5-e4fd-40cc-afa9-a45495a5accf.filesusr.com/ugd/7f929b_03625cb34e8c4493b2f0c7a43c6c5205.pdf?index=true
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001165f.bin
80ebe15cc800ee5a56546fc1ae52c28b1c5e6ce08f91cb6d30db303ac6be353d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1165F 3964 bytes
font_01_sfnt_off0001247e.bin
881debfe5d8e20c0b48198ab90a98eb2befac057268a2457e37ff272437f3db9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1247E 5216 bytes
font_02_sfnt_off0001362b.bin
23054fa37d5c7c0330346a78f0eb905394759e7019c48efaca010a800f3ee173		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1362B 11204 bytes
font_03_sfnt_off00015c2e.bin
6e47c8963670d7971fff5e8ab0e703642d30b62078af421b6c7536393ce1950a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15C2E 16304 bytes

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