Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e1f0f726adacf5f…

MALICIOUS

PDF

81.1 KB Created: 2021-03-14 01:35:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 033b92c01c5d231850d8475914841b84 SHA-1: 302a6167277ca7d938354e6de008b23ea55a0c2a SHA-256: 5e1f0f726adacf5fa7892265fb99f62519204ac8a14bb2654de4dff6c6f158f3
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://maypoin.ru/award?keyword=bullying+in+schools+articles+pdf PDF link annotation
    • http://tikovg.xyz/is_there_supposed_to_be_water_in_the_salt_tank_of_a_water_softenerbq7lp.pdfIn PDF document text
    • http://sugameloxufe.mywebcommunity.org/dibofelilotu.pdfIn PDF document text
    • http://vorgazme.com/dogotuxasudiwegijupok10n5.pdfIn PDF document text
    • http://safagiko.iblogger.org/gokazomaxapibetamitoruz.pdfIn PDF document text
    • http://techanomic.com/what_does_bank_compliance_officer_doaspbj.pdfIn PDF document text
    • http://winoraama.website/23741021569uhpc6.pdfIn PDF document text
    • http://bbbbbbbbeeee.space/69163061270ko416.pdfIn PDF document text
    • http://tokigarodam.22web.org/decisional_balance_worksheet_example.pdfIn PDF document text
    • http://boketizabujig.scienceontheweb.net/faguzomedosetel.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
    • https://945c5b1a-9feb-4a08-b72d-c905ca1b1520.filesusr.com/ugd/27135d_52c34790f73d435ba40f968c86670d6f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf31137b-50ff-4169-bcd5-e06d35804ee2/nobavisemexutegaxuvapizu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6677a595-5b4c-47f4-b10f-95a9a713f1f7/spoken_english_conversation_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a8a9a29-f879-4e2c-841f-173245ce0546/41873242987.pdfIn PDF document text
    • https://cc968bdf-8a18-4a65-a72d-893c706ef441.filesusr.com/ugd/bae363_b1c85e8fedcc4f808220cf87c1a1e88b.pdf?index=trueIn PDF document text
    • https://1237a3da-0b33-4890-9ba9-974507bf2590.filesusr.com/ugd/3e0cb9_d7e53b365352448d94c09056e26dc807.pdf?index=trueIn PDF document text
    • http://litorow.myartsonline.com/meeting_attendance_sheet_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1948442d-b2c4-4231-85eb-6daee198bd1b/what_is_a_good_kaplan_qbank_score.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/775f51db-d5ef-4344-90fe-d839bbbd70e7/lanize.pdfIn PDF document text
    • http://biforobajimebug.epizy.com/18194075897.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7dd560ea-d098-491e-a2e1-2fde8ca17cda/definicion_de_funciones_trigonometricas_inversas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47d4b8d3-245f-4bdb-bdde-6054859a011c/microsoft_word_2010_selection_is_locked_how_to_unlock.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a40652b-c3e0-4b64-a58d-fd5a69a88e5c/how_to_test_electric_oven_control_board.pdfIn PDF document text
    • https://b8436764-02b3-4471-8711-1e8fed235cf0.filesusr.com/ugd/3b3fbb_7255fcbcb38043e794e7c9e2aff4a4a9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fa4cf29-65eb-4c85-b7b3-a2e95200626f/ge_spacemaker_microwave_parts_door_handle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55cb9084-3c80-48e6-b09c-d47e5295f674/self-determination_theory_van_deci_en_ryan.pdfIn PDF document text
    • http://kilirafesiva.epizy.com/vemizarikes.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_off0000f2b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B2 5452 bytes
SHA-256: 192697cd78eeb51fda33bc84fe5ee7eb872fa4ac6ab2a3f701f126abf107df50
font_01_sfnt_off00010539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10539 10160 bytes
SHA-256: d6e554108f68633062b3d8a4fffbda78b59be787c5dcc729c70ef50d34264a3f
font_02_sfnt_off00012810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12810 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361