Malicious PDF — malware analysis report

Static analysis result for SHA-256 678de02529488b11…

MALICIOUS

PDF

119.8 KB Created: 2021-06-13 17:37:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: b5e30a0e6fcee1159e25aca7e0de8a87 SHA-1: 061f342c7aed4cd4fe7fa33314d6f553c1edf030 SHA-256: 678de02529488b11d363bac39c0c189d60fe92bd28f20944e05c6f296b920fc3
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 0.9996

Heuristics 5

  • 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 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://garglob.ru/pbw?utm_term=my+hero+academia+season+1+episode+2+dubbed PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4488807/normal_60bed32241cff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393521/normal_60b8f8bdd5287.pdfIn PDF document text
    • https://xajimago.weebly.com/uploads/1/3/0/8/130813364/fopagunik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468531/normal_6068858484025.pdfIn PDF document text
    • https://vonufire.weebly.com/uploads/1/3/4/5/134596457/2883500.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427828/normal_606b168ef0125.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446789/normal_5fd5f7b558330.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481422/normal_601a754645a0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365589/normal_60c528189b1c8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://pigedigasexu.pbworks.com/f/brawl_star_avengers_mod.pdfIn PDF document text
    • http://supijexed.pbworks.com/w/file/fetch/144586806/38854561342.pdfIn PDF document text
    • http://nagomax.pbworks.com/f/vandanam_i_love_you_ringtone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cf3f830-9f04-4cd9-b771-6b6c63cc2f97/2020_ford_mustang_gt_convertible_california_special.pdfIn PDF document text
    • http://fetinaduv.pbworks.com/f/69358190477.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40b5e75f-6f3d-4b4f-a551-ae0f2c6e24ab/avalon_ultrasonic_humidifier_manual.pdfIn PDF document text
    • http://sisiwovad.pbworks.com/w/file/fetch/144731601/how_to_take_first_response_early_pregnancy_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eac521f6-8e46-4e69-82b5-d86c4324894e/americas_book_of_secrets_special_edition_home_sweet_fortress.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/802c929b-9bd0-40f5-beb4-253897e5f6ac/what_are_other_words_for_visually_impaired.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e79f41aa-fdee-4067-82bb-e12f412c22e2/37715859144.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012ebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EBB 19548 bytes
SHA-256: 43c7c5dc1a620e917854886ea48aaa29da0041abc2dccd8eced7da50c0b74f1e
font_01_sfnt_off00016d68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D68 5712 bytes
SHA-256: c9383bbd1a5e451ed0c0c4c6435e3b9659d560ef876e670189250a7fe29e1153
font_02_sfnt_off000180ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x180AC 5812 bytes
SHA-256: ac46ee95c0fa6e3a7d391a0d808f02bfdea0c489ddbd44b21f539b2961f851a0
font_03_sfnt_off00018f45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F45 12988 bytes
SHA-256: dcddc1e571776a771b195ddcb4275f93a902df36ed2bed2d6bee093737218cb1
font_04_sfnt_off0001ba13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BA13 16536 bytes
SHA-256: 72f6277a2824607c475db5624cbc7b609c2199d1b8931b6c261ca29d36b6e475