Malicious PDF — malware analysis report

Static analysis result for SHA-256 efc79697d36d38f9…

MALICIOUS

PDF

86.6 KB Created: 2021-03-23 14:48:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 6fcbac7b24436f550a7e8b723d3acc11 SHA-1: d63ec5fa2beaa41225d48c6950285b293c5a083d SHA-256: efc79697d36d38f9270f874c9e1d00d083fab6273bd680c21f1be3043574d6f5
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 0.9994

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://druttle.ru/strik?utm_term=husky+30+gallon+air+compressor+oil+change PDF link annotation
    • https://cdn.sqhk.co/lasanamemego/jaqkwiZ/repost_for_instagram_regrann.pdfIn PDF document text
    • https://cdn.sqhk.co/gudopokobipa/f2BALgi/classlink_lake_travis.pdfIn PDF document text
    • https://cdn.sqhk.co/boguzivipel/ggjbhbS/50_in_1_free_games_june_2019.pdfIn PDF document text
    • http://lunatan.medianewsonline.com/crown_xls_2000_price.pdfIn PDF document text
    • https://cdn.sqhk.co/pimidima/fjd4idR/thrift_shop_valuation_guide.pdfIn PDF document text
    • http://sadinexiwa.mygamesonline.org/one_touch_ultra_2_user_manual.pdfIn PDF document text
    • http://toxipoxekej.medianewsonline.com/28808261595.pdfIn PDF document text
    • https://cdn.sqhk.co/fofubulami/ih6igHa/wugoto.pdfIn PDF document text
    • https://cdn.sqhk.co/kazakilen/d8tzijv/drive_in_theater_near_me_open_during_covid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453741/normal_5fd68234443ad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387056/normal_5fe2357155eeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464542/normal_601eda8c91536.pdfIn PDF document text
    • https://cdn.sqhk.co/lekibapufe/eOgg3je/30196612655.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469128/normal_60308717da375.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426063/normal_6047d28d89b59.pdfIn PDF document text
    • https://cdn.sqhk.co/xeloxilava/egiichi/netflix_party_chrome_extension_how_to_use.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/xukirizugukugi/scarlett_2i4_vs_steinberg_ur22.pdfIn PDF document text
    • https://911f1565-2faa-4874-b261-330d521e7362.filesusr.com/ugd/f46427_9f48bff159a545579d6ad0d8c8531c51.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jajuzasalikirut/12009786350.pdfIn PDF document text
    • https://s3.amazonaws.com/jivuxo/dopizogu.pdfIn PDF document text
    • https://1c896d37-30d1-4b4d-9537-98f963aae812.filesusr.com/ugd/865d50_b9feefb05f1c4e99a3dda92c5c96d5f8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rodiligarexo/what_is_the_civil_service_equivalent_military_rank.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/23883468506.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_off0001139e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1139E 5780 bytes
SHA-256: c26cde385e9ccd879855c3a3244b238f8d68c940d3d93089be337efb10763d7e
font_01_sfnt_off0001272b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1272B 11120 bytes
SHA-256: e16afc2d6260452e98c29a983b85021360b9d421e5bd1886b70ff3d1faa33afd