Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0c56d5ea3339188…

MALICIOUS

PDF

152.7 KB Created: 2021-03-10 02:49:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e4e8ad2db6dbbdc593708f61722b4050 SHA-1: 5e5cbc95c1cc9625f06cb05d262e4d8f8bc77e8c SHA-256: f0c56d5ea3339188c5337e789867a453c02906436ce34715702edc7ae19a5a84
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9947

Heuristics 5

  • 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 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://dafemum.ru/strik?utm_term=kung+fu+hustle+cast+list PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4474723/normal_5fec7b79524ea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443372/normal_5feba2ed7d382.pdfIn PDF document text
    • http://katermore.ru/motorcycles_for_sale_craigslist_oklahoma_city5rh8v.pdfIn PDF document text
    • http://paganel.world/brooke_shields_pornjmgfk.pdfIn PDF document text
    • http://lnstagramsupportingcenter.com/lg_wireless_earbuds_with_mic_reviewshulku.pdfIn PDF document text
    • http://topstop.site/vampire_the_masquerade_revised_edition3el9b.pdfIn PDF document text
    • https://cdn.sqhk.co/tavaxikanabu/jb4WhbT/84286359820.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447253/normal_5fd370815186d.pdfIn PDF document text
    • http://about-igsupport.com/check_ipad_battery_performanceylxk2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388174/normal_60132a84e5355.pdfIn PDF document text
    • https://mabalavorejeg.weebly.com/uploads/1/3/4/7/134769590/f31770fef375eee.pdfIn PDF document text
    • https://cdn.sqhk.co/ruvonusebex/AYheGD3/bleacher_report_live_tottenham_hotspur.pdfIn PDF document text
    • https://cdn.sqhk.co/sofizagumup/d94jeQE/52159754176.pdfIn PDF document text
    • https://nokesopupikes.weebly.com/uploads/1/3/4/7/134767934/9379645.pdfIn PDF document text
    • https://wezenazuzive.weebly.com/uploads/1/3/4/7/134764498/40aa04e83.pdfIn PDF document text
    • https://cdn.sqhk.co/mibuxedufexi/xighhpD/best_tumblr_themes_2020.pdfIn PDF document text
    • https://wafulezejo.weebly.com/uploads/1/3/4/7/134748518/4296920.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://46a1ac71-481d-4a85-b709-d40f3a189542.filesusr.com/ugd/143c98_ec5f6e0c74d14fc9a277b33138e5329b.pdf?index=trueIn PDF document text
    • https://01d67eed-50ba-4ccb-8f82-c1581f7ed07e.filesusr.com/ugd/e3325f_122b55820cc24723b863413746e30939.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/06a0c9d3-c3e3-4630-9ea7-b2ef2f6d0eae/54001379816.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b46f1260-71e0-4683-8af7-e8faa2a4d3f3/dusewufeseribuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66f3cd99-9e6e-4512-8176-ce108d6f7d36/what_are_some_common_themes_in_books.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fdc3690-25de-4ca4-9e34-869518b0dadb/kitotegavenod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ced1a3aa-5d56-48c3-8a08-2b82811f488e/hermle_340-020a_manual.pdfIn PDF document text
    • https://0dea665b-aaaa-42f3-a52c-f86f0fd1efa2.filesusr.com/ugd/8b9728_0ae7d16b27b147c390e6ec14b2104547.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18184 43100 bytes
SHA-256: 1998fdeab722fb86812be2bf85712ee54e092e72d42fe92021df08ab13cfa915
font_01_sfnt_off00020597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20597 5016 bytes
SHA-256: dda8d5b3171aa022f1e28bdd5ac0ae3ac1954b78fe9315cbe551a5c9bfb6c118
font_02_sfnt_off000216bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x216BC 12528 bytes
SHA-256: b1e547f9ff9cb5aefae0eb6a152131a6561eec1946d5976e789cbb8c934a643e
font_03_sfnt_off00023fa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23FA3 16060 bytes
SHA-256: 4c0a3f0893f5e69c6acf0c6b7f036872587aec6188c41bdd40a009ab43c82216