Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7f23ff343faf0f7…

MALICIOUS

PDF

77.0 KB Created: 2021-03-31 09:56:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: d4c019ce2d92e26db55768704977b756 SHA-1: 7d6285eab35a6e023bd3d10147d7a4622999ef69 SHA-256: f7f23ff343faf0f7cb1ab84341f2cda20017ca986d291d703db7bfbd2754d589
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links that redirect to known malicious or disposable hosting domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing lure, likely using JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/award?keyword=sherlock+holmes+pdf+stories In PDF document text
    • http://lotto-investclub.com/tetopadujuranariwarimanifs4gj1.pdfIn PDF document text
    • http://moitender.org/manuale_sistema_multimediale_toyotap9k4u.pdfIn PDF document text
    • https://cdn.sqhk.co/tirazirevemu/gb1w2ii/utorrent_movies_free_for_android.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • http://braco.ru/battlestations_pacific_formation_settingsanc5x.pdfIn PDF document text
    • https://cdn.sqhk.co/gotoruzud/uZ9hagj/gifitovejukabamimo.pdfIn PDF document text
    • http://oneshops.space/67875147811dvusp.pdfIn PDF document text
    • https://cdn.sqhk.co/kevovevude/gjjaYhe/biguvob.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rivazixexuguri/94000083463.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b561ab92-9f6d-4e0b-8111-7d335ce94618/stan_getz__joo_gilberto_the_girl_from_ipanema_ft._antnio_carlos_jobim.pdfIn PDF document text
    • https://321e46d8-a3e9-4523-905f-b0dcd1dcb7ef.filesusr.com/ugd/29fbc3_ba2ca2afff52456bbd68dbe376c7a13e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sedimeraxufi/python_discord_bot_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e194844-545b-4fc8-ac3e-05a5b8f609e8/dofezilekolozuwilufejon.pdfIn PDF document text
    • https://d86ad34a-7df2-4f47-937b-a12ab5abc0fa.filesusr.com/ugd/8cbfce_136325c34cb1457c92722982df89e230.pdf?index=trueIn PDF document text
    • https://30621b86-6952-4b41-80af-4d24d830bc7c.filesusr.com/ugd/122077_7b2e1b284fea4859a288bdd14a921281.pdf?index=trueIn PDF document text
    • https://d71fc03c-aea6-48f7-a990-8afffb22108d.filesusr.com/ugd/3de8a6_4b53ce27f24b49a482a1977aa1dd5d81.pdf?index=trueIn PDF document text
    • https://33fe1336-4051-433c-b691-b763732126dd.filesusr.com/ugd/6c8f37_299bc6cef0ea41de80e7e2e41e6d6f87.pdf?index=trueIn PDF document text
    • https://72cee60b-533f-4fda-9f40-87b1bb6f0553.filesusr.com/ugd/590778_d2b9ffc9017142fa8e6d1643d0cd3db0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3bfbe00-66a6-4a00-a9ab-f203da27c65e/how_to_reset_my_u8_smartwatch.pdfIn PDF document text
    • https://8eeb1f0a-0cdd-4c66-98a4-83777b49fb54.filesusr.com/ugd/64f9d2_6fb6acc521004f7a811413774ac6a4dc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cd0b564-17a0-4043-9414-50f87497a6cf/puloxazesos.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_off0000efd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD7 5352 bytes
SHA-256: c60f02841f55ec43fa34b06a39258982ff7715eb8476203edee910dfb916cff5
font_01_sfnt_off000101e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E3 11532 bytes
SHA-256: 16e73d0e65776b9f961adced0083db7075ad42c9bd9eae5768c7254ac0b5ad63