Malicious PDF — malware analysis report

Static analysis result for SHA-256 f85c3fa7e2f4d93e…

MALICIOUS

PDF

86.2 KB Created: 2021-01-22 23:58:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 062c87f4fe7a11a6e1a999117669d2d0 SHA-1: a39b8a30ec5836a9406589a12ee572eac961efcf SHA-256: f85c3fa7e2f4d93e491c4df740eca79a1d1d3442f16f6f7263cb32fb8f724327
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a likely attempt to redirect users to malicious sites. The presence of external URIs and the 'link farm' heuristic strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafftec.ru/123?utm_term=dr+seuss+books+pdf+horton+hears+a+who PDF link annotation
    • https://cdn.sqhk.co/kuzosexiwugu/u9Yhjgd/instagram_captions_for_guys_selfies.pdfIn PDF document text
    • https://site-1178668.mozfiles.com/files/1178668/hepatitis_b_lab_test_report.pdfIn PDF document text
    • https://site-1179856.mozfiles.com/files/1179856/jidigoxuzopexosikalufed.pdfIn PDF document text
    • https://cdn.sqhk.co/bitaxukezor/zH1uhcs/knights_chronicle_tier_list_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/rubuxupab/IrgfrqQ/3452811129.pdfIn PDF document text
    • http://sowaviwexurejo.22web.org/inorganic_salts_lab_report.pdfIn PDF document text
    • https://cdn.sqhk.co/bulunazi/j6IihkF/air_traffic_control_ireland_live.pdfIn PDF document text
    • https://site-1244434.mozfiles.com/files/1244434/crash_bandicoot_pc_2.pdfIn PDF document text
    • https://cdn.sqhk.co/lokuwanij/iaPrGYu/bubble_bird_rescue_2019.pdfIn PDF document text
    • https://site-1178351.mozfiles.com/files/1178351/xiwugizasuwuremajo.pdfIn PDF document text
    • https://cdn.sqhk.co/xufaribo/H26icd1/98236233817.pdfIn PDF document text
    • https://cdn.sqhk.co/binebelezux/ighhjjg/painting_pumpkins_with_tempera_paint.pdfIn PDF document text
    • https://cdn.sqhk.co/diratukuz/uihigeu/tik_tok_funny_videos_in_telugu_download_mp4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pimorem.epizy.com/6549055310.pdfIn PDF document text
    • http://tosivasode.epizy.com/convert_arabic_into_english.pdfIn PDF document text
    • https://s3.amazonaws.com/sefabe/grapecity_activereports_12.pdfIn PDF document text
    • https://s3.amazonaws.com/midaguvimabof/tisatezavoxur.pdfIn PDF document text
    • http://pomigipasa.epizy.com/how_to_cite_mla_format_8th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/mivokozibu/immigration_affidavit_of_support_guidelines.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000128ba.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x128BA 20956 bytes
SHA-256: 8cac53b0f5ff6d74f9b794a5700b7577f59ca0964342ba3085550e01cd422bd8
font_00_sfnt_off0000f13a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13A 5392 bytes
SHA-256: 1f7ffdf279787a9c6de911011ee9a1ce3a393df0fb0355d7c27354123f8b0589
font_01_sfnt_off0001039f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039F 10728 bytes
SHA-256: a740303c0887cdbb80d026043c6d8c87f8ca54694e3d33acb359ac93c561eebf

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