Malicious PDF — malware analysis report

Static analysis result for SHA-256 9782a745767eb8a7…

MALICIOUS

PDF

76.9 KB Created: 2021-02-25 16:34:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 6fff6767dc0b483a9f16bc462b00d4fa SHA-1: 755d9414bedd5eeb6d364ff624f9d71d66f30f1d SHA-256: 9782a745767eb8a7b5bf37a6a6c405043cbbffd7b857526f38ed3103ce6ae809
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 domains and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://bologen.ru/award?keyword=men%2527s+air+force+1+low+white+size+9.5 PDF link annotation
    • https://cdn.sqhk.co/nemisova/rndfhiU/free_triple_diamond_slots_no_download.pdfIn PDF document text
    • http://jadelurapesa.22web.org/arris_tm822a_lights.pdfIn PDF document text
    • http://itfamily.pro/aatma_bandhuvu_movie_songs_frees97mi.pdfIn PDF document text
    • http://4bochki.ru/how_many_quarts_of_oil_does_a_2003_6.0_powerstroke_takevo40w.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://sajurewe.rf.gd/ronco_3000_showtime_rotisserie_gloss_black.pdfIn PDF document text
    • http://fotopokidag.epizy.com/21596017779.pdfIn PDF document text
    • https://s3.amazonaws.com/figugipopar/82884840102.pdfIn PDF document text
    • http://jowofosepenomun.rf.gd/58211930889.pdfIn PDF document text
    • https://s3.amazonaws.com/pujirageg/full_hd_movies_kabir_singh.pdfIn PDF document text
    • http://pazatirademe.rf.gd/cartoon_song_free_mp4.pdfIn PDF document text
    • http://fewuzefar.rf.gd/the_room_audience_participation_guide.pdfIn PDF document text
    • http://gepikadagutuv.epizy.com/83610602456.pdfIn PDF document text
    • http://wereguvepowu.epizy.com/piriformis_syndrome_squat_university.pdfIn PDF document text
    • http://jepatejefa.epizy.com/akele_hum_akele_tum_song_likewap.pdfIn PDF document text
    • http://suwedafi.epizy.com/math_bingo_printable_worksheets.pdfIn PDF document text
    • http://pisatetakedabak.epizy.com/91045692204.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e24e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE24E 5304 bytes
SHA-256: 8dfdd053599890226150c94010deb7c5a63b71577eb5e3ef3ca17ca4db287417
font_01_sfnt_off0000f47c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47C 10396 bytes
SHA-256: d962ae804d28bc33aeceb41f7e17eb5dff01681515915f2af1e01da7babfea67
font_02_sfnt_off00011819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11819 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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