Malicious PDF — malware analysis report

Static analysis result for SHA-256 a064a20eeb7c85d3…

MALICIOUS

PDF

72.2 KB Created: 2021-04-03 02:06:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 2925ffa6cb4effceb0f37b6195a4a9f8 SHA-1: de169b791e62d46cacfef6662dffb2351c7120cf SHA-256: a064a20eeb7c85d3d8a3a1be6c3eacae1f67983ea8999ca3d75291a941fd90a8
186 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The embedded URLs and the overall structure indicate an attempt to lure users to potentially harmful websites, likely for phishing or to download further malware.

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://maypoin.ru/123?utm_term=android+auto+2.+9+carstream PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4391634/normal_5fdf3d1d0e93e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373259/normal_60625bac29419.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427519/normal_602d4b9317c24.pdfIn PDF document text
    • http://smotrikino.fun/dark_souls_3_wiki_flynns_ring20yj2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475739/normal_600e080bd1df5.pdfIn PDF document text
    • http://floradoma.net/can_i_use_baking_powder_with_plain_flour_instead_of_self_raisingzm0ux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373241/normal_6034d40379351.pdfIn PDF document text
    • http://everydays.space/free_dating_sites_for_bisexual_females8s0ev.pdfIn PDF document text
    • http://mestorating.ru/fafilinaguderusedibilodangr5ax.pdfIn PDF document text
    • http://shoop-fk.ru/41197361774ztkar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tamovagag/33864361381.pdfIn PDF document text
    • https://s3.amazonaws.com/zusevamasor/can_a_trickle_charger_be_used_as_a_battery_tender.pdfIn PDF document text
    • https://780c8f77-0f51-49ab-8dd1-60a90eb210a4.filesusr.com/ugd/1b8612_8a705e78c6474e1093ee941ea318e694.pdf?index=trueIn PDF document text
    • https://48bd7725-9370-4d18-884e-e75d7b70c9c4.filesusr.com/ugd/f241d9_c87a9f69d76a4f72bdff815099fb5191.pdf?index=trueIn PDF document text
    • https://af1bea64-f5cd-41c2-a7c1-97f21c1aa057.filesusr.com/ugd/592671_c7111d6446ab4a5ca25cb2eb53fbe0e2.pdf?index=trueIn PDF document text
    • https://7605d98d-8b17-4a41-9383-f5c8d5af9bcc.filesusr.com/ugd/2bed4c_92f4e0a8872e4312b76d80356764da83.pdf?index=trueIn PDF document text
    • https://291e86d0-b4b7-455e-aeca-30cd05102b29.filesusr.com/ugd/384a46_bf6f597dd04d4505b32046f075f729ec.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/redegelesibif/how_to_do_rope_knots.pdfIn PDF document text
    • https://07e0a16e-b77d-475b-b724-88bbaedb347c.filesusr.com/ugd/8e9e2f_045d0252d8694808bf6371a3f26b45d6.pdf?index=trueIn PDF document text
    • https://574dee49-ee40-4737-ae02-340ce2b26f9d.filesusr.com/ugd/b44cf7_14fa96185d8348c8a259ac47ba2057c6.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4E 5360 bytes
SHA-256: 76f65450e7a884e96113b1cbcfa2591da08a78fbed8d5b385a553e1d0d920a2e
font_01_sfnt_off0000ee7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7A 10396 bytes
SHA-256: 16af3fbb546f4dd14629da63080589930f74da292ffdaba3b8b31a4307432972