Malicious PDF — malware analysis report

Static analysis result for SHA-256 15d5a0afe83172e5…

MALICIOUS

PDF

76.5 KB Created: 2021-03-16 11:21:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 048563aa8df70b4d6d331ea407cefc2c SHA-1: 28e42a51af7a9c3cbc864914a10ce908d9436fc3 SHA-256: 15d5a0afe83172e54f0e7382cf9c28e97ab73f687e92a1de666eebc095fa5d91
186 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains a large number of embedded external links, many pointing to disposable domains, indicating a link farm or redirection scheme. The heuristic PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM specifically highlight this behavior. While no scripts were explicitly extracted, the nature of PDF link farms often involves JavaScript for redirection or obfuscation, hence the inclusion of T1059.007. The primary attack pattern appears to be leveraging the document as a lure to drive traffic to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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 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.
  • 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/wix?keyword=el+paso+de+la+muerto+yahoo PDF link annotation
    • http://tedurelaseji.mygamesonline.org/vifoxu.pdfIn PDF document text
    • https://xafusotegemuwif.weebly.com/uploads/1/3/5/3/135304795/7828186.pdfIn PDF document text
    • http://xuxetosufuzo.getenjoyment.net/58563868906.pdfIn PDF document text
    • https://cdn.sqhk.co/nojumuku/iuIhbjf/necromancer_girl_names.pdfIn PDF document text
    • https://cdn.sqhk.co/jalotenabo/aihPnfe/31173553680.pdfIn PDF document text
    • http://lezirumari.sportsontheweb.net/9185028091.pdfIn PDF document text
    • http://fakurivevid.scienceontheweb.net/les_miserables_cast_recording.pdfIn PDF document text
    • http://fakaluwu.scienceontheweb.net/laboratory_apparatuses_and_their_uses.pdfIn PDF document text
    • http://ruwemipuwev.mypressonline.com/82970032213.pdfIn PDF document text
    • https://kurinasuvofete.weebly.com/uploads/1/3/5/3/135334761/993781.pdfIn PDF document text
    • https://pixipemojawipe.weebly.com/uploads/1/3/4/4/134459682/1304376.pdfIn PDF document text
    • https://cdn.sqhk.co/ripalufix/b8TXdps/exorcist_stairs_georgetown.pdfIn PDF document text
    • https://cdn.sqhk.co/lizasizova/ifhfghQ/latigo_de_sheldon_tonos_frikis.pdfIn PDF document text
    • https://xoxigukot.weebly.com/uploads/1/3/4/8/134861038/julolagisilite.pdfIn PDF document text
    • https://cdn.sqhk.co/raxoxawupej/IaihibJ/62759229593.pdfIn PDF document text
    • https://befufagu.weebly.com/uploads/1/3/1/3/131384284/4af652ae38fa6.pdfIn PDF document text
    • http://fuzubijixulux.mygamesonline.org/abrsm_guitar_scales_and_arpeggios_grades_1_5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8a05da06-75fd-4b4b-8779-f7668a2fa4a0.filesusr.com/ugd/da32d9_e36f448a8fd446ee9e5817fb59878bcc.pdf?index=trueIn PDF document text
    • https://ba85394b-11ac-4ca4-926b-74ca936c52e1.filesusr.com/ugd/5ccfc8_70d23719c1fb4e1d96e7d2c6aa1a0e12.pdf?index=trueIn PDF document text
    • https://f9c380c0-3c9a-404e-8c76-a924832b335c.filesusr.com/ugd/9c8fb9_11ccd6ec3a1042949a62c5ce17aeaf16.pdf?index=trueIn PDF document text
    • http://pemopewepubik.rf.gd/dojoxiwukorisax.pdfIn PDF document text
    • http://zakefuki.myartsonline.com/what_is_the_ugliest_land_animal.pdfIn PDF document text
    • https://9387bd13-3746-4408-b474-2867f26e464d.filesusr.com/ugd/ace02d_ab4d2db1379a4705b711e9a83742861b.pdf?index=trueIn PDF document text
    • https://4b0cdf75-2e42-4830-99f1-bbdbaec3f661.filesusr.com/ugd/891219_6e99a25a3bd7421382d91595dc9c8332.pdf?index=trueIn PDF document text
    • http://sizokipizap.rf.gd/diy_king_pallet_platform_bed.pdfIn PDF document text
    • http://wozawexopad.epizy.com/dodesoberifefefiki.pdfIn PDF document text
    • http://xuneviwek.epizy.com/weber_smokey_mountain_brisket.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED26 5256 bytes
SHA-256: 6da80cb2174243358f502bbe8e1bb316cdbdf39f8286d71c78f44ab8da6b98c1
font_01_sfnt_off0000fede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDE 11052 bytes
SHA-256: 81af9263d65ccd79a656db1e8dba4432eeb89d543dd0ea07f1b2cd74d3d132b9

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