Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4b7269e78a455b0…

MALICIOUS

PDF

74.3 KB Created: 2021-03-09 14:08:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 94f5db71e6285901eeaf94fa3645ce3f SHA-1: ed0fbd57a56e061b3aa384d2a6dcdfafa39c74d3 SHA-256: c4b7269e78a455b0eb452e09882cfefb2cabd5a08aaa07441553b88e701a8b1f
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a large number of outbound links designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing further malware or phishing for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/123?utm_term=crossword+quiz+answers+movies+level+4 PDF link annotation
    • https://radunepik.weebly.com/uploads/1/3/4/6/134617153/xifowol-tosepo-luferoxele.pdfIn PDF document text
    • http://karnaval.host/nozotuzemafemenuzifivurq3ss.pdfIn PDF document text
    • http://duzixofiwisegi.mygamesonline.org/lufuzelatinamubaxipemekaz.pdfIn PDF document text
    • http://wumewil.sportsontheweb.net/xaxokirozuvevorevoki.pdfIn PDF document text
    • https://kozegefiseram.weebly.com/uploads/1/3/1/3/131379202/9303193.pdfIn PDF document text
    • https://sobopagugakevul.weebly.com/uploads/1/3/4/8/134881985/8154437.pdfIn PDF document text
    • http://lobulezinovux.medianewsonline.com/jasumififirelel.pdfIn PDF document text
    • http://cashthe.ru/xesewetevaknpet.pdfIn PDF document text
    • https://mewopufi.weebly.com/uploads/1/3/4/2/134265659/1e3e4c90b34.pdfIn PDF document text
    • http://topstop.site/23123906022nhned.pdfIn PDF document text
    • https://morimisinasezub.weebly.com/uploads/1/3/1/8/131856414/jologarikaxum.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/5fe567e0-5aaa-49e2-8563-50c4d74dca6c/twilight_full_movie_download_in_hindi_all_part_filmywap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/999245b9-3c31-4cca-84ea-ee6f0cb0adb8/musoxirumezag.pdfIn PDF document text
    • http://timojodabemisux.myartsonline.com/nonajuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57d010e8-bd5d-41c7-9f6f-dc8031c0dd54/predicas_cristianas_cuando_lo_que_dios_hace_no_tiene_sentido.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eef4d199-adb7-4d7a-9406-22aacc5af9a7/vozafefiwagudef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/651bac88-b51a-4e99-8181-94a98d0c1fe5/ampli_fishman_loudbox_mini_charge_used.pdfIn PDF document text
    • http://kipazafar.atwebpages.com/tom_clancys_jack_ryan_season_1_episode_5_cast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28ffc6b2-5444-44f3-adab-827e08b34c97/nike_air_force_1_white_mens_sale.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_off0000e6ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AC 5292 bytes
SHA-256: 5aff748f9e10a3d444c4ed3148d85a4b54dcc69abe82221b000e3b010aba583f
font_01_sfnt_off0000f8b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B1 10384 bytes
SHA-256: 5f1e0ff8ae940eb663e6259a1df6ba811cf7ab4e20740bc4255c3bfd43ca105a

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