Malicious PDF — malware analysis report

Static analysis result for SHA-256 54ab5e9de113eba0…

MALICIOUS

PDF

84.6 KB Created: 2021-04-05 19:47:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: f4032b58239a1943c5ad0724a2aff4c8 SHA-1: 6199a9fde0c8e019d6e94cf0a2146ace17017a10 SHA-256: 54ab5e9de113eba0e0945ccca01b9c6a59a0fa206aad8d17e19b5104f7a5ded7
186 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a PDF link farm. It contains numerous external URIs pointing to other PDF files, many hosted on disposable domains, suggesting an attempt to manipulate search engine results or distribute further content. The presence of external links and the nature of the heuristics strongly indicate a phishing or content distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://bologen.ru/award?keyword=ripasso+analisi+logica+pdf PDF link annotation
    • http://tatajosak.22web.org/zuwevipameruwites.pdfIn PDF document text
    • https://jovopunok.weebly.com/uploads/1/3/4/8/134869647/0b59544.pdfIn PDF document text
    • https://cdn.sqhk.co/moxulofilose/hqhijc1/converse_chuck_taylor_platform_sneakers.pdfIn PDF document text
    • https://cdn.sqhk.co/vapumojemov/C8hcjij/pop_slots_free_coins.pdfIn PDF document text
    • https://cdn.sqhk.co/xozifejor/jdGyidr/pandemic_game_rules.pdfIn PDF document text
    • http://vulubibobi.iblogger.org/18118488059.pdfIn PDF document text
    • https://megidawuxuta.weebly.com/uploads/1/3/4/7/134729580/jivopakumisu-zubolotodawem-feninit.pdfIn PDF document text
    • http://gukibipujuregof.22web.org/bank_job_solution_book.pdfIn PDF document text
    • https://cdn.sqhk.co/gizivapejoko/jqpmvig/funny_answers_to_what_you_up_to.pdfIn PDF document text
    • https://cdn.sqhk.co/fipufose/idgivmj/kanuwabiwuf.pdfIn PDF document text
    • https://cdn.sqhk.co/neseleko/giHYgiU/pearl_face_cream_price_in_hyderabad.pdfIn PDF document text
    • https://pulezigo.weebly.com/uploads/1/3/4/6/134600697/5120346.pdfIn PDF document text
    • https://cdn.sqhk.co/xovatagemi/Qidifjj/78977100473.pdfIn PDF document text
    • https://cdn.sqhk.co/zowesifona/qiasojj/90763441108.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://uploads.strikinglycdn.com/files/8b66e2ad-3bf6-4cfc-9488-63d963244ca3/vijegobopexubupusoruk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a8535ff-6dcb-47cf-aaef-4f772b8d42b8/elizabeth_clare_prophet_books_download.pdfIn PDF document text
    • http://jivixolijenirew.rf.gd/scanner_bosch_obd_1150.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72512ef9-9625-48ab-ba7a-8ee61fe351ae/62144348172.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1eefb6c-705b-4925-b86d-00ec337122d7/16147027473.pdfIn PDF document text
    • https://s3.amazonaws.com/metakibeme/expressing_feelings_worksheets_for_kindergarten.pdfIn PDF document text
    • https://s3.amazonaws.com/papuja/bobo_doll_study_hypothesis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3adab8d1-ea48-4f51-b5d1-f83e2ef4a8a8/el_crimen_de_la_calle_morgue_edgar_allan_poe_resumen.pdfIn PDF document text
    • https://s3.amazonaws.com/jirebonudur/making_inferences_worksheet_high_school.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_off000101bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BD 4824 bytes
SHA-256: 9dfd25399ae8caa0e259fc0e9ab0eeaf8056a942bf7792c46b90a84e91aff0b9
font_01_sfnt_off00011228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11228 11308 bytes
SHA-256: 86325c7820d97eb4cbb8681134b3d09af992f81fd12271134a2d463e35c95766
font_02_sfnt_off0001370a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1370A 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e