Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0b627c7fcd423aa…

MALICIOUS

PDF

81.1 KB Created: 2021-04-02 02:17:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 26bd0ba34f67c55316f313e5567e274e SHA-1: 3cfd11b74054fb03eb7fdb7f5c96c908ba9656f7 SHA-256: a0b627c7fcd423aa19a2e6c03fe6038d375c4d5c454449b2e4e17e01220037d5
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, contains keywords related to 'dehydration in infants' and 'pdf', likely a lure to disguise the malicious intent of directing users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/award?keyword=dehydration+in+infants+pdf PDF link annotation
    • http://wuramegojuluz.mywebcommunity.org/shimano_r2000_reel_manual.pdfIn PDF document text
    • http://bugosegu.scienceontheweb.net/vedisiburekixaxufunilokow.pdfIn PDF document text
    • http://businesslinecenter.com/easy_beginner_easy_kiss_the_rain_piano_sheetgryxf.pdfIn PDF document text
    • http://sandwichhq.club/what_order_do_diary_of_a_wimpy_kid_go_in4zgqh.pdfIn PDF document text
    • http://toreret.scienceontheweb.net/social_phobia_inventory.pdfIn PDF document text
    • http://xuxijosut.sportsontheweb.net/how_do_trees_look_like_in_summer.pdfIn PDF document text
    • http://bodaweziwov.mypressonline.com/arabic_to_urdu_dictionary.pdfIn PDF document text
    • https://sekatuxu.weebly.com/uploads/1/3/4/8/134894727/7552627.pdfIn PDF document text
    • http://usacreditmonitoring.info/diy_painting_kitchen_cabinets_ideasrgdn2.pdfIn PDF document text
    • https://tanedozuwo.weebly.com/uploads/1/3/4/6/134644204/sefipijabegu-konuf-waviva-fugozowojobavu.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://levapen.rf.gd/94694088421.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1a876f5-d16e-4199-b31b-4af91d3b728e/livadisevanofugelonope.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ace7fe23-4fcd-48b6-8857-973dcb40d850/how_to_make_easy_paper_boat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6091f03c-a90f-4bbb-96cd-802a5b1a4eb0/leasehold_what_happens_after_99_years.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46f9e284-e968-4e93-9b02-362a1bb99e10/what_is_big_data_in_health_informatics.pdfIn PDF document text
    • http://pevurabune.rf.gd/jizokuxunowebut.pdfIn PDF document text
    • http://sitiwaruto.rf.gd/washington_dc_museum_opening_hours.pdfIn PDF document text
    • http://zusewijoje.epizy.com/foselaxeziluvirapilawo.pdfIn PDF document text
    • http://zipemoluligera.myartsonline.com/what_are_the_steps_of_usps_tracking.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_off0000f41e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41E 4988 bytes
SHA-256: 060b54c24ec365a6508c43c2a91550989ca12784ec595b15aca86f3f140f440d
font_01_sfnt_off00010517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10517 10464 bytes
SHA-256: 0050bf6405579c2f3dde8ccbca24e14cf89457d89091c31f5802c246f74923d4
font_02_sfnt_off000128f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F7 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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