Malicious PDF — malware analysis report

Static analysis result for SHA-256 19b5fe9a3db1b119…

MALICIOUS

PDF

73.4 KB Created: 2021-03-21 07:28:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: becdcaaf88549ade55f14c3067879111 SHA-1: b1dcf458c46e3206bc02ae1cf6de41bd1ae99996 SHA-256: 19b5fe9a3db1b1195ce2f82e615761c9051eca7cc1e29a185b84d6d0e6d9cfcc
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded URLs, with one directly referencing "idle heroes hack no survey" and pointing to a suspicious domain. Heuristics indicate this PDF is a link farm on disposable hosting, and ML classifiers and ClamAV strongly flag it as malicious, likely phishing or a trojan. The presence of embedded URLs suggests an attempt to redirect the user to a malicious site for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/wix?keyword=idle+heroes+hack+no+survey PDF link annotation
    • https://cdn.sqhk.co/tigixexaxi/UFVihS9/jitivibavize.pdfIn PDF document text
    • http://vvinorama.fun/how_to_activate_poll_everywhere_in_powerpointvvinz.pdfIn PDF document text
    • http://omerkatanalp.com/51716836563o4ama.pdfIn PDF document text
    • http://creamwalls.online/ap_style_book_citationsw9246.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490961/normal_5ffb78f97c48f.pdfIn PDF document text
    • http://xezimebes.22web.org/analog_magazine_submission_guidelines.pdfIn PDF document text
    • https://cdn.sqhk.co/xidafigutoxa/cDFvpgc/pedironoxirixuzesosixu.pdfIn PDF document text
    • http://kadanijojabuf.mywebcommunity.org/95733068236.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447646/normal_6027f04dd0962.pdfIn PDF document text
    • http://shopbest.online/petsafe_2_meal_feeder_troubleshootingg5fgg.pdfIn PDF document text
    • https://cdn.sqhk.co/renonidofel/i6hbhjS/five_nights_at_freddy_s_characters_tier_list.pdfIn PDF document text
    • https://cdn.sqhk.co/rugofufol/jgEbCgi/plane_driving_simulator_games_online.pdfIn PDF document text
    • http://fagumawegoleleb.mypressonline.com/fifty_shades_freed_free_novel.pdfIn PDF document text
    • http://getchambre.xyz/wasofepigoziwonajigumapadym.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414691/normal_6006e737c7f36.pdfIn PDF document text
    • https://cdn.sqhk.co/reteduze/ehbjfgj/fatogusomofebotigapubabu.pdfIn PDF document text
    • https://cdn.sqhk.co/sasibasodiwu/hhjgjg4/valigasezemowexaguf.pdfIn PDF document text
    • http://gexopidikimo.mygamesonline.org/kugeje.pdfIn PDF document text
    • https://cdn.sqhk.co/lirerafi/bH8Wjb8/oh_k_bubble_sheet_mask_review.pdfIn PDF document text
    • https://cdn.sqhk.co/josipinu/tibvPVt/bell_motorcycle_helmets_amazon.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://zimekinolidi.rf.gd/wopekevojomaxowasi.pdfIn PDF document text
    • http://musomowelego.epizy.com/angular_ng_template_let.pdfIn PDF document text
    • http://juwiwigepumer.rf.gd/barron_s_gre_psychology.pdfIn PDF document text
    • http://fidalanono.myartsonline.com/zexewofejirijalek.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_off0000d8f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F5 4944 bytes
SHA-256: 21bf33a1277346a4503da30a63ab47e32965b7352b51c2cd39eb1a7bb08cd38f
font_01_sfnt_off0000e9b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B1 9636 bytes
SHA-256: a4e66620d5149460cae3317aed070310c07a12c54d2edd9b22892106bf141701
font_02_sfnt_off00010a20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A20 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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