Malicious PDF — malware analysis report

Static analysis result for SHA-256 63ea80c7ef620719…

MALICIOUS

PDF

81.0 KB Created: 2021-04-03 15:39:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c2d009acd247e011fa6ecdfb871a2ed4 SHA-1: 1a5b958c0a89a2fb46a22c60fb84d278c265a465 SHA-256: 63ea80c7ef6207198727eb6e6d1b2b9eb6410b997aeb68a7e7b5a5d55562bf49
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 0.9967

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=who+is+justin+in+one+of+us+is+lying PDF link annotation
    • https://ketadamofexawun.weebly.com/uploads/1/3/5/3/135349072/nuwegugez.pdfIn PDF document text
    • https://cdn.sqhk.co/vitimosugu/TE0rOhf/bcit_medford_phone_number.pdfIn PDF document text
    • https://cdn.sqhk.co/bomumuxa/cgdiajh/fefakowisizojaz.pdfIn PDF document text
    • https://cdn.sqhk.co/jevikepuja/jhdgcrq/open_camera_apk_ios.pdfIn PDF document text
    • https://votebefi.weebly.com/uploads/1/3/4/7/134715150/vizubipurugiwu.pdfIn PDF document text
    • https://cdn.sqhk.co/noxibogalu/TGhgjb9/noselaguxutugam.pdfIn PDF document text
    • http://icub.tech/black_diamond_headlamp_manual_revoltxx1yp.pdfIn PDF document text
    • https://kerimoseb.weebly.com/uploads/1/3/5/2/135299904/zugivonobajoguro.pdfIn PDF document text
    • https://xovobinawulum.weebly.com/uploads/1/3/4/8/134883327/nenajifen.pdfIn PDF document text
    • http://bnl-jobs.com/91179416949ytn2j.pdfIn PDF document text
    • http://help-ruleviolation.com/392679009283u0ia.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2ea3657d-1c4c-40dd-8491-58aeeb8dc933.filesusr.com/ugd/18a85a_b9ea6f1cfaf1425eb7a8a5ae2f5186b7.pdf?index=trueIn PDF document text
    • https://fb79ad55-22b5-4823-9538-35c71bbbd514.filesusr.com/ugd/ea423f_a9c92c1ef5014342a223c809871ef6b4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nefunupu/lista_giocatori_fantacalcio_gazzetta_dello_sport.pdfIn PDF document text
    • https://c6111751-42b6-464f-a8b1-832d492ff999.filesusr.com/ugd/3d0627_90e7404976c24437bac9ad9597d8ae52.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wuwabobujasivor/15407491267.pdfIn PDF document text
    • https://s3.amazonaws.com/vavale/bullet_force_mod_apk_data_offline.pdfIn PDF document text
    • https://c216880a-03a2-4774-ab7e-121c93799e8f.filesusr.com/ugd/b5aed9_4c4c987b8ed24c0c996d78ecd2cc1260.pdf?index=trueIn PDF document text
    • https://5b949be5-44ef-49af-96c7-0ebaa8fe632e.filesusr.com/ugd/3402b1_87deb35c37bc49f88c02edf68e3148ea.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xijuxosisomuna/vmware_horizon_client_for_windows_7.pdfIn PDF document text
    • https://s3.amazonaws.com/lolijexejomak/top_30_question_and_answers_at_interviews.pdfIn PDF document text
    • https://63b1f34b-4847-450f-8d9a-4788d10e1cf5.filesusr.com/ugd/451a43_f92e6213ffb94afab63e4012f7d60e9b.pdf?index=trueIn PDF document text
    • https://c02a3fa2-970f-4384-b4fa-7a60184a1b73.filesusr.com/ugd/1da3fe_52a6e8b3ae794dcab6ffdbf4dca45a8e.pdf?index=trueIn PDF document text
    • https://67bb8873-ca08-4da4-87c0-60a8072ebff6.filesusr.com/ugd/a838c0_8264df19ed1c42e9a5815887f8710300.pdf?index=trueIn PDF document text
    • https://c8f6a2ed-bc8a-4fd4-b26a-19707db7c4cd.filesusr.com/ugd/1cc7e8_e8cdadd665224394bd5bd0c0638162fb.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_off0000ff9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9F 4912 bytes
SHA-256: 9ae629dd9f8c7d22249182f194f2773812ab6f097c19aee2ea3ff52222c832af
font_01_sfnt_off0001107c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107C 11140 bytes
SHA-256: 8d357cafea5491c2caf534e35d710fd2863b95a2542d99155edc4d019405e211