Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0cdb35f6bcd3d20…

MALICIOUS

PDF

83.1 KB Created: 2021-04-29 02:01:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 5502ccfc6900d1746215080830d6f822 SHA-1: 7dc54655b98fba9c4d9d7b4184ad9a0a607bbe01 SHA-256: f0cdb35f6bcd3d20046f88e146c36ec96c1b57eb3fa780fa2969cbc0949983b0
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are likely part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains a search query suggesting a lure to external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://zajinet.ru/strik?utm_term=how+do+you+cook+ribs+on+a+smoker PDF link annotation
    • http://mazejofeg.mygamesonline.org/jubojojejaj.pdfIn PDF document text
    • https://zenugewitewane.weebly.com/uploads/1/3/5/9/135960096/latababume.pdfIn PDF document text
    • http://bewizasosu.sportsontheweb.net/95689193765.pdfIn PDF document text
    • https://cdn.sqhk.co/rafumufo/ihHjdcv/note_taking_methods_for_middle_school.pdfIn PDF document text
    • https://pusiruse.weebly.com/uploads/1/3/4/7/134717846/getifijinuxofimus.pdfIn PDF document text
    • http://fakutuzogazu.sportsontheweb.net/72410611491.pdfIn PDF document text
    • http://dogalijun.scienceontheweb.net/how_to_draw_an_isometric_view_by_hand.pdfIn PDF document text
    • https://cdn.sqhk.co/bitomasijelo/Ohhqjb3/34328578546.pdfIn PDF document text
    • http://rofuxipof.mywebcommunity.org/belgrade_public_transport_map.pdfIn PDF document text
    • https://cdn.sqhk.co/xuvomuvugu/Wighhhe/stir_it_up_johnny_nash_bob_marley.pdfIn PDF document text
    • https://cdn.sqhk.co/vobevufubito/CEfFEhg/37437282196.pdfIn PDF document text
    • http://lobabinuladeri.medianewsonline.com/62400740212.pdfIn PDF document text
    • http://vevufilusik.scienceontheweb.net/map_of_the_world_with_countries.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/kakekojezutok/ordinal_number_in_english.pdfIn PDF document text
    • https://s3.amazonaws.com/dopugaxelelema/karcher_power_washer_hose.pdfIn PDF document text
    • https://s3.amazonaws.com/fapaga/sedaris_santaland_diaries_npr.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/252a3c05-c629-4c00-b069-f0deb7d34f14/4596350606.pdfIn PDF document text
    • https://s3.amazonaws.com/nonipesikiri/82382445952.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a183e60d-f7b4-4647-a195-65e0912a4d48/24926248787.pdfIn PDF document text
    • http://xojudemavu.onlinewebshop.net/bilugowefowa.pdfIn PDF document text
    • https://s3.amazonaws.com/zodererezuzuxi/what_happens_if_i_overeat_one_day.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_off0001062d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062D 5412 bytes
SHA-256: 1fa96fffeda4efa321d833267e8f270321b9781ea37104812aefa67bce2b5ba2
font_01_sfnt_off00011895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11895 11516 bytes
SHA-256: 125135b524dd9d687de809b140f83cc0328d5ab82a92068ecb94857dd90556dc

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