Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb4f8bbab125b605…

MALICIOUS

PDF

86.5 KB Created: 2021-02-27 19:13:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 0105d06f1780b058b55657c6e55d6440 SHA-1: 91cbfe7d7b22395bc73e9a5e4b2399fbea6e873e SHA-256: cb4f8bbab125b605fdc32afac1e2071575b7d625ee1590278676d295ef457215
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, many hosted on disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest the document's purpose is to redirect users to malicious sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://leonvi.ru/123?utm_term=alfred%2527s+essentials+of+music+theory+answer+key+unit+10 PDF link annotation
    • https://cdn.sqhk.co/zanivuwiduvo/jjjjTic/dirt_bike_hill_climbing_technique.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388617/normal_60135f43d78e1.pdfIn PDF document text
    • https://cdn.sqhk.co/jisepozidis/dXigjjW/54338101029.pdfIn PDF document text
    • http://sujabupinoda.scienceontheweb.net/totodobul.pdfIn PDF document text
    • https://cdn.sqhk.co/bojowagawire/fGd9hcj/86872609671.pdfIn PDF document text
    • http://giwapozolaleg.mypressonline.com/ella_minnow_pea_chapter_1_summary.pdfIn PDF document text
    • http://tehnikator.ru/declaracion_universal_de_derechos_humanos_1948_resumenc5dn7.pdfIn PDF document text
    • http://lazirog.mywebcommunity.org/garmin_nuvi_2595_price.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381980/normal_6001374234f83.pdfIn PDF document text
    • http://goligofalu.medianewsonline.com/reloading_supplies_las_vegas.pdfIn PDF document text
    • http://awpmode.com/32798745230lzhtu.pdfIn PDF document text
    • https://cdn.sqhk.co/mazonixun/jiWUjg9/82763783339.pdfIn PDF document text
    • http://24goodstore.site/59441566022474vy.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://xakagigoneliv.myartsonline.com/the_cat_in_the_hat_knows_a_lot_about_that_episodes_wiki.pdfIn PDF document text
    • http://sebokegekesuded.atwebpages.com/124946261.pdfIn PDF document text
    • http://bawawajabatura.epizy.com/cloridrato_de_amitriptilina_bula.pdfIn PDF document text
    • http://tinanatibora.rf.gd/mendeley_web_importer_not_saving.pdfIn PDF document text
    • http://vozuxekeve.rf.gd/tonokazifudozu.pdfIn PDF document text
    • http://tutalisog.rf.gd/angry_birds_go_apk_mod_2018.pdfIn PDF document text
    • http://wuzegez.epizy.com/st_andrews_high_school_bloemfontein_application_forms.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF213 5620 bytes
SHA-256: f7d4760d4ffd875fbb54fe4b515cef958ba729548e8f53354bfeaf1b94a256ba
font_01_sfnt_off0001051c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051C 10568 bytes
SHA-256: 87991e44062814596acbef0749986479ca6fe076647a8a90958d51a9a98fdb54
font_02_sfnt_off00012907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12907 16120 bytes
SHA-256: 46d9b83afd797048ab251ddfc9ca9a6db44f3280724c231f6a80a061bcc6fc12
font_03_sfnt_off00013df0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DF0 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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