Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fdd2995d00d0c6e…

MALICIOUS

PDF

126.3 KB Created: 2021-03-25 02:23:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 322df22ae4080469651ca2537bbf76e3 SHA-1: 2c94ca67dc6051488507ce9d38eaa6fa3bf473c7 SHA-256: 6fdd2995d00d0c6eb790c2e0a8e9cbef390fe66caadb52306fbc752094148084
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a significant number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary URL, 'https://gimoguvi.ru/strik?utm_term=how+to+write+an+address+to+northern+ireland', appears to be a redirector for this link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 6

  • 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 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://gimoguvi.ru/strik?utm_term=how+to+write+an+address+to+northern+ireland PDF link annotation
    • https://wobipogipexiwom.weebly.com/uploads/1/3/1/0/131070125/1316522.pdfIn PDF document text
    • http://usesalle.xyz/dante_divina_commedia_inferno_canto_5t8xru.pdfIn PDF document text
    • https://cdn.sqhk.co/zisafebu/haZaGgd/edgar_allan_poe_worksheet_answer_key.pdfIn PDF document text
    • http://mediaverifiedbadge.com/booklet_template_ks1zbxyg.pdfIn PDF document text
    • https://dudidupu.weebly.com/uploads/1/3/1/3/131380390/zinasizalul-rukalakelo-xirotot.pdfIn PDF document text
    • https://fuwelobuzade.weebly.com/uploads/1/3/4/6/134649994/a0852cfceeaadbc.pdfIn PDF document text
    • https://zowololo.weebly.com/uploads/1/3/5/2/135294949/4892430.pdfIn PDF document text
    • https://biwakegexenulu.weebly.com/uploads/1/3/4/4/134437141/lodixativip.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/Coljfza/20686375296.pdfIn PDF document text
    • https://cdn.sqhk.co/vaxarogajib/sdfEwhh/download_game_angry_birds_friends_mod_apk.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://jegepifewomu.epizy.com/mujezapik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34d9d4e2-8a2e-4e11-9261-bad3cda322c0/how_does_a_stock_become_a_penny_stock.pdfIn PDF document text
    • http://furofazitogo.epizy.com/25290057759.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb76675b-abf6-4801-81a7-bcbea7c5e79b/the_aeneid_translation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cf96518-d624-46d1-a77e-67fe5c7afe1b/why_is_refrigerator_working_but_freezer_not_freezing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d54e45ce-20cc-452e-981b-fe62c655492e/how_to_get_the_line_of_best_fit_on_desmos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6c40be1-ba4f-4eab-96b5-f5fbf4db9568/teaching_english_as_a_second_language_graduate_programs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4c5862d-ca35-4ca3-8cdb-87c7e87670b2/67229100833.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ec34541-55cd-4cc5-86cf-fdf83484bc82/best_f2l_algorithms_j_perm.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49ecdaac-8f15-48ca-8831-69ce1189676a/19060898065.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92271e9a-e1d7-42b1-8ae9-a6be9086673f/fawelonovodikuk.pdfIn PDF document text
    • http://fozijasorizol.epizy.com/76111769256.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17399 4752 bytes
SHA-256: 3199152f42847b0b01b7f57a699c0bd82241f300aeeca14d3003c4b591e432bd
font_01_sfnt_off000183b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183B4 16060 bytes
SHA-256: 8869f1169cfc9fc61b5d7292df4d7c8416bc09ccb1fd5760ec1078b0e6288eac
font_02_sfnt_off0001b3f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B3F5 21120 bytes
SHA-256: 1b081122127b692e4076912d636694a5b267b11a4a3f8dc240090bb22774eabc
font_03_sfnt_off0001da6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DA6E 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361