Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c1ef81a5341020c…

MALICIOUS

PDF

86.1 KB Created: 2021-03-22 12:14:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: e4a0a020587e8b31330e3d34763d0802 SHA-1: 728305594d640b13a04d191b9a69c48c8779e4e9 SHA-256: 5c1ef81a5341020c2eeb11930853283954f3b3f2c17155ec3d0a01bba403908a
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/wix?keyword=cumberland+maine+fairgrounds+events PDF link annotation
    • http://ketousa.site/forex_for_beginners_anna_coulling_free_download1s0yb.pdfIn PDF document text
    • http://xariketixagat.mypressonline.com/jupabareruxipiwukevepawol.pdfIn PDF document text
    • http://ergors.space/gibazkmc0t.pdfIn PDF document text
    • http://topdouche.xyz/dabivojalajo1ttsw.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://solejow.myartsonline.com/habitos_alimenticios_libros.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa96d07a-3675-41f9-be1f-1d3cc3d44df4/fl_studio_mobile_free_download_android_2020.pdfIn PDF document text
    • https://6bc553e5-d0de-4278-827a-c77c8eb32fbd.filesusr.com/ugd/4a6c57_145b1291654e4af4abaf914904d854f9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0272f854-3902-4617-9d0c-8808473261cc/singer_3116_simple_18_stitch_sewing.pdfIn PDF document text
    • https://s3.amazonaws.com/satulibaren/33274621738.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40f622dd-cf08-4287-8731-8cf23aa21072/jomak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e26126fc-b8ce-4f86-b4cd-7ccd044a194b/lifoxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b56568c-999b-406d-901a-272922c346a9/what_should_an_emotional_first_aid_kit_comprise_of.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a17a6237-1a64-4cd5-b287-40a51574c526/president_johnsons_plan_for_reconstruction.pdfIn PDF document text
    • https://e9593579-f51f-4dc6-af55-2543ab512b45.filesusr.com/ugd/37952c_e552809edff44da8a64fb3761e5d951c.pdf?index=trueIn PDF document text
    • http://sopavame.onlinewebshop.net/62337936966.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/635ffa50-fcf1-4f88-bb0f-bd185c4f7208/molina_medicaid_transportation_michigan_phone_number.pdfIn PDF document text
    • https://s3.amazonaws.com/luborinizu/seventh_day_adventist_church_membership.pdfIn PDF document text
    • https://85fc0914-20e3-4f1c-be8c-de7e6f89f47e.filesusr.com/ugd/a44510_9e3de567f2954046a7775f5ba9d262b8.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_off00010211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10211 5332 bytes
SHA-256: 5c17a6410c5bda61cccba228ea0b639517c4b5b2bb08fa33e95dfe70c085774f
font_01_sfnt_off0001141a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1141A 12080 bytes
SHA-256: d2340142192d1663e6a5ce7c216374419e5c2cf705a51f7b6fde17b844f2167f
font_02_sfnt_off00013d50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D50 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333