Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2f7c498a10f8981…

MALICIOUS

PDF

77.4 KB Created: 2021-03-17 22:54:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0951b4a6a545c40af6ffcfa5eb7f28d4 SHA-1: 9a235afebfb81d6e2fae22033331550e38ef80c4 SHA-256: a2f7c498a10f8981b410451648b05598f14910471c71aa535646ce3eb91414ef
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 0.9998

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://kuzutuzo.ru/wix?keyword=illinois+license+plate+fp+meaning PDF link annotation
    • https://kixesikanunezez.weebly.com/uploads/1/3/4/7/134702505/rigez-sofev-tawabewi-fefaf.pdfIn PDF document text
    • https://bipagaposelugi.weebly.com/uploads/1/3/4/4/134479594/netobanatikow.pdfIn PDF document text
    • http://velesvoyage.ru/how_to_write_good_essay_conclusion7xic8.pdfIn PDF document text
    • https://rafesotel.weebly.com/uploads/1/3/4/3/134321319/zalizewonazojozajijo.pdfIn PDF document text
    • http://tadurarawi.mypressonline.com/73462242986.pdfIn PDF document text
    • http://kelnoteres.xyz/blanket_cover_sheet_cheapbi72k.pdfIn PDF document text
    • https://rusokupos.weebly.com/uploads/1/3/4/4/134468665/5031175.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/fadc57c2-96d0-492d-adab-3ac9a514f865/2162232707.pdfIn PDF document text
    • https://6fd4412c-3e6e-4f21-a9af-8137ffc6c0d9.filesusr.com/ugd/03469c_0d2857bc313d498396fb821fe073d898.pdf?index=trueIn PDF document text
    • http://dowafirowelumex.atwebpages.com/wofafoxinogogokiwuxen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39590b34-cb2f-4859-be9e-feed633f28c5/how_to_write_thousands_in_ap_style.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c69cf87f-0e01-4e73-a560-9410e9cb34f7/pubobolusuludinajoja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6907d295-303f-4a3b-be96-31f8ac5158fd/brother_ls_2125_price_in_uae.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d70d3bd4-0cd0-4932-bc2d-65c476128a5e/john_deere_l100_brake_parts.pdfIn PDF document text
    • https://d896c2b7-539c-4146-aa8a-b39d26e096d8.filesusr.com/ugd/a98ecc_7890f6f6b1dc4414b28a9b4f3ad4a7c1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/906e8e49-ec08-4eb5-b7ec-12eef3168356/the_dialectical_behavior_therapy_skills_workbook_a_new_harbinger_self-help_workbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/178ff42a-d52f-4cea-9b87-63b18c1592ee/pegidukupinizetuwixu.pdfIn PDF document text
    • https://ad060920-74d0-4a59-a46a-f478898ed72a.filesusr.com/ugd/a7c1e6_de6501b7e43c4b26a2431087b41579be.pdf?index=trueIn 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_off0000e516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE516 4964 bytes
SHA-256: f391f814c7628a2bd67b6cc188b0d1443970ca8dcef09aae372fe60c6a652f40
font_01_sfnt_off0000f5df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DF 10736 bytes
SHA-256: b378a4a2c5062d11f1392c08c017db32eddc7c8d9afcc4e528ef70121a3d78d6
font_02_sfnt_off00011a9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A9F 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333