Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a0d8a361bdee178…

MALICIOUS

PDF

76.5 KB Created: 2021-04-02 17:58:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: bdaf4622951260aa34cde3f936d7a43e SHA-1: f615d2adcc3de9eaeb057b4223503110e95e40f1 SHA-256: 4a0d8a361bdee1789c6c81fe9e9af0c032e8321faba0baa1f5340b49adcbb0ef
126 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. The document contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure strongly suggest an attempt to trick users into downloading malware or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://nipisod.ru/strik?utm_term=how+to+download+offline+dictionary PDF link annotation
    • http://thecabinets.xyz/nikiditikovulezorepaziguw0ozqf.pdfIn PDF document text
    • http://fuxakuzaporelu.iblogger.org/tinuvalitunemokugu.pdfIn PDF document text
    • https://cdn.sqhk.co/bepasasa/oZNCRI8/55184087265.pdfIn PDF document text
    • https://cdn.sqhk.co/pigajifaw/jiQgihg/88224032386.pdfIn PDF document text
    • http://muzoc.xyz/10301617046nc4v6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459029/normal_602f3e8e25f8a.pdfIn PDF document text
    • http://kajopikika.22web.org/24650234672.pdfIn PDF document text
    • https://cdn.sqhk.co/zojoguxuban/xYtygid/top_10_list_makers_crossword.pdfIn PDF document text
    • https://cdn.sqhk.co/xoxujagemo/ggwhejf/bollywood_new_video_song_site.pdfIn PDF document text
    • http://rukafuxofi.iblogger.org/22361606502.pdfIn PDF document text
    • http://ganutaragifak.22web.org/ti84_plus_ce_charger.pdfIn PDF document text
    • https://cdn.sqhk.co/nufesewepi/dEgcgjd/how_to_do_a_wedding_cake_topper.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366984/normal_60496f35770e4.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/2e3c4a72-5b63-4fa9-bdc6-df7d045ac7ab/14871857231.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d05d7a55-5826-471c-86f1-190430766067/green_eggs_and_ham_season_2_release_date_australia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e62951ef-996d-4506-be6c-166fb37d832d/kenmore_elite_he5t_washer_f21_error_code.pdfIn PDF document text
    • https://6cf80756-66c2-4d2e-b15d-ff1677cb7115.filesusr.com/ugd/2257e8_7bb09c8c182c4012a16df7707cea57e7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5fbdb20-c360-4229-b667-c421ce3cb965/55689636468.pdfIn PDF document text
    • https://064d663d-f6b2-44cf-a6ad-083da5f315e5.filesusr.com/ugd/77eba6_628c72dc5960406ea81287ed1dd29fde.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8499a2c-dec2-4532-afcc-78444c38b385/mibakexoxa.pdfIn PDF document text
    • http://fosisidevafepet.epizy.com/62473984213.pdfIn PDF document text
    • https://eac5c218-d238-408c-98a6-8ff0ecbb25fc.filesusr.com/ugd/b1277d_ed140caa04f1418eaf2370e38e695e0a.pdf?index=trueIn PDF document text
    • https://9907981b-0bc7-4fd3-a434-169f7cdadf42.filesusr.com/ugd/575363_d711fe24f0ac4fba96e13f9de67b8c30.pdf?index=trueIn PDF document text
    • https://7c3dd69e-6649-485e-b385-36acc2971cd6.filesusr.com/ugd/cf9ff1_292e74a0be3b442e9bf4d7e3706fa1cf.pdf?index=trueIn 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_off0000efda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDA 4992 bytes
SHA-256: 107cc8169fe200db484709ce4ade18185bddf28ce187b14f561de1fc9c57f58f
font_01_sfnt_off00010100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10100 10380 bytes
SHA-256: ec559fe1fc5c398915d661647b7fc76e68ece000d98118ee5651476fdca3dc5b