Malicious PDF — malware analysis report

Static analysis result for SHA-256 720e592652620fb3…

MALICIOUS

PDF

76.1 KB Created: 2021-04-04 03:06:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 8e9cc878455ec526383539e2cc5e04de SHA-1: 2737a9a0aad083bc1a51533c0721c92d7c18e39c SHA-256: 720e592652620fb38d11bcd9d95d9a457974588e0fc64dbf39f0b014358ab575
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with a significant portion pointing to disposable hosting and acting as a link farm, suggesting a phishing or malware distribution scheme. The presence of 'utm_term' in one of the URLs further supports a campaign-driven approach.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://baarspo.ru/strik?utm_term=my+many+colored+days+music PDF link annotation
    • http://kajuzumanaz.sportsontheweb.net/space_food_nasa.pdfIn PDF document text
    • http://napanawojezej.iblogger.org/active_passive_complete_rules.pdfIn PDF document text
    • http://kukusorukabapoj.iblogger.org/distress_tolerance_handout_6.pdfIn PDF document text
    • http://gulakami.22web.org/15685722173.pdfIn PDF document text
    • http://zanodopowe.sportsontheweb.net/3314741781.pdfIn PDF document text
    • http://jivopifavu.22web.org/97093396519.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://debalipusafuj.epizy.com/77976490273.pdfIn PDF document text
    • http://vomelokupav.rf.gd/wixugapepi.pdfIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/jazifeporajewijudobes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b563608d-cb31-4e8d-9d0e-74e3519206e4/2004_infiniti_g35_automatic_transmission_fluid.pdfIn PDF document text
    • http://sikirubuguje.epizy.com/wow_classic_blacksmithing_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b5a210c-3021-4341-bda8-a1ab09a39456/anatomy_colouring_book_for_nurses.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a4baa31-3444-4390-b828-cfb7bbe77e01/tejorasuwabofi.pdfIn PDF document text
    • https://s3.amazonaws.com/jolozidabi/climatograms_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e251ddb6-040b-4019-a306-a1ce31b0e275/korean_alphabet_chart_with_sinhala_translation.pdfIn PDF document text
    • http://nopuxawox.epizy.com/sulivikagu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20957da4-1458-4e1c-b62d-8bddd68a4585/how_do_you_use_self_clean_on_ge_oven.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71112f25-b46f-4c08-979c-45e102e3e994/daxawikugamo.pdfIn PDF document text
    • https://s3.amazonaws.com/voxipanovigepiv/akureyri_map.pdfIn PDF document text
    • https://s3.amazonaws.com/tobojelusiwi/adobe_photoshop_lightroom_pc_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e44c7fa-1696-4173-8dbd-a56f2b4e0cc3/tippmann_98_custom_paintball_gun_value.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0a948bf-2143-425e-a3ff-412458ae8af8/dell_inspiron_n5010_specs_i3.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_off0000ec1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1A 5192 bytes
SHA-256: 32c30399b21b9fa3ccdac4f239e403f5f8ce32312603662aa00502e091e78e52
font_01_sfnt_off0000fdb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB6 10924 bytes
SHA-256: d4c7aba929ccbad5526ae737639be297f2d11f046c83d1b03c1ef62c5fbe7cd9

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