Malicious PDF — malware analysis report

Static analysis result for SHA-256 51ddda3963f79217…

MALICIOUS

PDF

107.3 KB Created: 2021-03-19 20:50:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 990195429bbdfde431bb657efcf7e996 SHA-1: e649acb9d9ce6b0acab9e457fdf607ccddb4dceb SHA-256: 51ddda3963f79217fde46d0df8d4ae76fdcbfcb35fa4caa2ce0a75fbc1d7ebb4
66 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, with one prominent URL leading to a suspicious domain. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. Although no scripts were extracted, the presence of external URIs and the ML classifier's high confidence score point towards malicious intent, likely to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://pelibifir.ru/strik?utm_term=what+is+the+poem+prometheus+unbound+about PDF link annotation
    • http://sokobumoxagug.scienceontheweb.net/mubusaxekilurixulam.pdfIn PDF document text
    • https://xuxozuxar.weebly.com/uploads/1/3/5/3/135326767/8677055.pdfIn PDF document text
    • http://dvigatel.guru/canon_mp240_service_manualrbbfq.pdfIn PDF document text
    • http://creditscorefix.info/dunkin_donuts_hazelnut_iced_coffee_ingredientsr92c6.pdfIn PDF document text
    • http://spain50off.info/274759004428yu2a.pdfIn PDF document text
    • https://cdn.sqhk.co/dalubevemex/hfqhcja/origami_butterfly_knife_easy.pdfIn PDF document text
    • https://cdn.sqhk.co/ludafojebi/Fiidtna/sapelojelurijif.pdfIn PDF document text
    • http://avto-trokot.xyz/how_old_was_brandon_burlsworth_when_he_diedhdgzo.pdfIn PDF document text
    • https://cdn.sqhk.co/zenetofuma/hjjahco/98390610046.pdfIn PDF document text
    • https://cdn.sqhk.co/jupujezaxa/haheGv1/lavezixopekuraxitewenaxe.pdfIn PDF document text
    • https://dusonomikeka.weebly.com/uploads/1/3/2/6/132695238/e3f4964.pdfIn PDF document text
    • http://goxivomibivufuv.mywebcommunity.org/anodea_judith_wheels_of_life.pdfIn PDF document text
    • https://cdn.sqhk.co/burexewejam/jbbhc2g/cookie_clicker_hack_wikipedia.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://kavibajegis.onlinewebshop.net/american_history_textbook_mcdougal_littell_answers.pdfIn PDF document text
    • https://203e7bc3-08d7-4ecc-a8df-f797e0d4a079.filesusr.com/ugd/d4579c_e5cfc73a11074d6e9b53f008b3104da9.pdf?index=trueIn PDF document text
    • http://lobaman.epizy.com/meshki_size_guide_review.pdfIn PDF document text
    • http://kujavuven.epizy.com/wing_chun_wooden_dummy_used_sale.pdfIn PDF document text
    • http://jesuxesuner.rf.gd/3963270234.pdfIn PDF document text
    • https://bb74f61c-7045-47bf-9a7e-968101ee373e.filesusr.com/ugd/81ef4b_7a3123792d70441bb2d6b240f5f68607.pdf?index=trueIn PDF document text
    • http://rewakagofeloze.rf.gd/25739668554.pdfIn PDF document text
    • http://wiwafejopof.epizy.com/butler_parker.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001599c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1599C 5200 bytes
SHA-256: 750d2944d1a9af11d9beeca8392328c92e33b94fc525c79529b17bad2647c3d8
font_01_sfnt_off00016b1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B1A 11384 bytes
SHA-256: cc0f9f37a7b5a4981fe68a2426db6ee5540a6aafdbeff3c45cfb1f7dd6de812e
font_02_sfnt_off00019181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19181 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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