Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9cc8fe763dee2cd…

MALICIOUS

PDF

80.7 KB Created: 2021-06-05 09:59:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: b77bfcb04073994ffa612a2507a5d8a2 SHA-1: 79d7fd6a8a1aa4bed173d8e3dbc55824dcf69604 SHA-256: a9cc8fe763dee2cd9abfbc091e9d47c6c0bdf223a416ff523e753510dfe41325
156 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 0.9993

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 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.
  • 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://philabc.ru/pbw?utm_term=cantemos+al+amor+de+los+amores+acordes+en+do PDF link annotation
    • https://popaxeras.weebly.com/uploads/1/3/0/8/130814769/5773320.pdfIn PDF document text
    • https://rigavedisibabaz.weebly.com/uploads/1/3/4/9/134902328/5789036.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486033/normal_6003ea7cf1e19.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454045/normal_5ff7653d71ef5.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In 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/89b01c5f-9bcc-4c24-916a-23d1a3832a91/manual_de_reflexologia_facial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bff5ef2c-e2bb-49b4-9d86-4f072281eaba/22430897765.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6154e569-0123-4bfc-ac2d-0bb67e2d73c7/are_bad_boy_zero_turn_mowers_good.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee291f01-9afd-4d1c-8d9a-62db02d31824/common_core_standards_california_grade_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e42e7728-635d-4f51-b05e-1e16983fc62c/22964221425.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55140cd7-db42-4fa7-ab61-ca3f6c62ed72/sacred_geometry_symbols.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b80c5f70-f79b-4c3d-84b8-114181c8f204/garmin_920xt_black_silver_band.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28dc12a0-db8f-47e9-b8e4-64c8e5bfd82e/jubejazelote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ada83dcc-6217-49b2-acc1-b0699b66ffeb/how_to_use_fuzzy_logic_rice_cooker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c8b105a-164f-4cb3-aeb4-62e14c6013c6/vigulalarogadevib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eef1241b-57df-4aa9-a231-692c8b505d36/91094012081.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4671ff53-a13c-4c06-a7e0-8578442d8ea5/78784581341.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af87e35c-f1a2-46f8-83e4-ed8c0033905b/ejemplo_de_un_plan_de_negocios_de_una_panaderia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44eb4ca2-6ecd-4dc1-ac9d-286582c26de6/diep.io_developer_cheats.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46bb3b96-4b87-49f4-b375-775060b4d5ec/16787928614.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c46b4cb-de53-44b6-82f0-fdc79ce1d9f5/tensile_test_of_mild_steel_lab_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06245805-eb38-44bf-b5d4-6c8307ab3008/neo_gothic_architecture_elements.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF9 5180 bytes
SHA-256: d109bffca0576b00aced7fdc0c3473278550ee5d7594986326551ff4e24da453
font_01_sfnt_off0000ede2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE2 4848 bytes
SHA-256: 1549d67a71c81affdef216cd75b0666ae2858e0a6a7fa8e94b7546bbb9b5fbac
font_02_sfnt_off0000fe40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE40 12000 bytes
SHA-256: 1e75475078299ec1f8721b91262d1538283e0ae1b3bbadf50fa733e14114b669
font_03_sfnt_off000124e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E7 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3