Malicious PDF — malware analysis report

Static analysis result for SHA-256 c16c4f84cbf63230…

MALICIOUS

PDF

75.4 KB Created: 2021-03-15 00:59:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 668f03da9be2969ff6cd0f49b09f91d2 SHA-1: 59b6dc6f78f789e1e858a156d393f4354218299a SHA-256: c16c4f84cbf63230cca7eb39d86eac24552173402d04c808c36e5ea58b44b591
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/strik?utm_term=singer+3116+bobbin+case PDF link annotation
    • http://xiluzoxasefeb.iblogger.org/audiocodes_configuration_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/rureroso/gBhghg7/sidigefarad.pdfIn PDF document text
    • https://cdn.sqhk.co/zenetofuma/TrUOnaR/gerajunapufufato.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/37ca42eb-814d-463e-9e27-fc5fd7c2c81b/when_to_use_user_stories_in_agile.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1430913c-9a3e-4a69-818b-a7fdc3c4ee36/dunkin_donuts_careers_uae.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7bbfe5c-eaa6-43b8-a467-8255ed46f811/adding_fractions_with_like_denominators_anchor_chart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95543cdb-8185-4c08-95c5-c38276971d32/sears_catalogue_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26213e82-104d-46e2-bba2-673fd0194390/python_numpy_random_float_range.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6706acc6-615d-419d-8821-3c3a6150e930/best_sword_fighting_moves.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8e11683-cf01-4d4c-a124-255f14460415/80570787773.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9759fe2-65cf-4db4-bf1b-1d40cb70ff72/12495224856.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e402e05f-c1f4-4845-a2bd-a48bdfc08dcd/how_to_connect_a_new_remote_to_a_lg_tv.pdfIn PDF document text
    • https://5e0c4d4d-41f9-428c-9564-b93e7cff6769.filesusr.com/ugd/510691_95b29d6135964939ba47e62c6a1982e2.pdf?index=trueIn PDF document text
    • http://pimudovi.epizy.com/gejidevede.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71419688-1c59-4855-b742-b93c71849001/91911752658.pdfIn PDF document text
    • http://vetarobafawuk.epizy.com/pofasifasarevudegos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7045cfa-5b2b-408f-8fc7-ecbaf0c2c336/leon_uris_exodus_film_deutsch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a33f6093-586b-46cc-91f7-44e4917d06f3/on_writing_well_free_download.pdfIn PDF document text
    • https://c63ca81c-6df4-4ec3-bc2e-8508f29a6879.filesusr.com/ugd/d48fe3_70f1816cca024a29b0ed8f48a51e7530.pdf?index=trueIn PDF document text
    • http://fizufanotujo.epizy.com/65675457169.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_off0000e5f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F7 5548 bytes
SHA-256: c7caff269eb730470f0134ea7007b0810edf9f8920541a6d8513abc58eef4c08
font_01_sfnt_off0000f8e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E4 11548 bytes
SHA-256: eaeae39cc534944fe0380a57853a2fc3ae07e0839c431e6199daba1e64dac41a