Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f3853dc68aba507…

MALICIOUS

PDF

75.4 KB Created: 2021-03-22 16:55:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: bcf6b05f5f923d218d7538f8d88b7eb3 SHA-1: 20d5e431c9be77fb0f31657b5b96783f2f2c70e2 SHA-256: 0f3853dc68aba507fa9a498d20dbf76cf5c7c36c428d91b97c36bba467d01545
156 Risk Score

Malware Insights

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

This PDF document is identified as malicious by multiple heuristics and a machine learning classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many of which are likely part of a link farm designed to redirect users to malicious websites. The primary URL identified is https://midufefew.ru/strik?utm_term=movie+genres+exercises+pdf, which is suspicious. The document's content is presented as a benign exercise, but the underlying structure suggests a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 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.
  • 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://midufefew.ru/strik?utm_term=movie+genres+exercises+pdf PDF link annotation
    • https://reratedazakowim.weebly.com/uploads/1/3/1/3/131378897/776048.pdfIn PDF document text
    • https://cdn.sqhk.co/linaxezo/cgggd49/monster_fishing_legends_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwumixe/gJHifig/swingman_baseball_logo.pdfIn PDF document text
    • https://cdn.sqhk.co/tajudozizif/gfJgiO6/brick_breaker_3d_jar.pdfIn PDF document text
    • https://sosedegif.weebly.com/uploads/1/3/2/8/132815053/mevoko.pdfIn PDF document text
    • https://cdn.sqhk.co/perikowep/ihsmiUv/nazebilijuzodebisozufi.pdfIn PDF document text
    • https://cdn.sqhk.co/posiraki/al1fZhi/berilaf.pdfIn PDF document text
    • https://cdn.sqhk.co/zumedizojas/gTohejg/true_skate_glitches_underpass.pdfIn PDF document text
    • https://xiruzukigipimog.weebly.com/uploads/1/3/4/8/134865515/f4ff7abd7c8.pdfIn PDF document text
    • https://cdn.sqhk.co/mifigatira/ctOwyhj/ricetta_caponata_senza_peperoni.pdfIn PDF document text
    • https://cdn.sqhk.co/rubogomuweme/hIheSij/toy_truck_rally_3d_apk_cepde.pdfIn PDF document text
    • https://dawopodesolapip.weebly.com/uploads/1/3/5/3/135327749/dutobamaj.pdfIn PDF document text
    • https://tamipabofoj.weebly.com/uploads/1/3/4/8/134876193/9735153.pdfIn PDF document text
    • https://cdn.sqhk.co/jutigurotow/VJhfRhh/paintball_shooting_3d.pdfIn PDF document text
    • https://cdn.sqhk.co/naliwanik/ifjihjz/mutewitokinoro.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/75bbca74-eb6e-4cf4-ab15-5995dc420c16/introduction_to_the_practice_of_statistics_6th_edition_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b4a014f-f3b2-4755-8d27-c37a8c8e86cf/17776134933.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8b64306-3481-4885-a2e4-e2398519b219/pokemon_backpack_playset_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bbecfb6-4035-4116-81a0-ff6cb5fc8a30/87560169455.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3c325e3-3ec1-43a6-a2b0-f9a87caa9fd0/44699508447.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efc55a07-06b3-4380-90f2-e1a43a048ed9/5644677785.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99ef7e36-4339-40b0-ae9a-d8a08c9dab63/74586895416.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84133e0d-ee8a-4d61-8c2d-fdddb1a1b14e/zunapu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b35942e-9c3b-408f-a014-73081a47a81b/p90x3_meal_plan.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_off0000e986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE986 5212 bytes
SHA-256: e5b0ef720ba710dafbb271291949a76aa83d3e2cc46b8347c87e444818daac94
font_01_sfnt_off0000fb79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB79 10816 bytes
SHA-256: 532e12886b49139cc341f275a244f81a9131acff3520dcc2e84880b4823492e9