Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf2638b4ed2145fc…

MALICIOUS

PDF

78.9 KB Created: 2021-04-03 09:10:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 86e3ba725516c2e1ef5e2a34df56986a SHA-1: 525a96dae0ed62dad2df3b80cecff8c03b12635a SHA-256: bf2638b4ed2145fc1b23436b9a7723408c32de4c49c33c0b9c53e324943e776b
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 0.9990

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://pelibifir.ru/wix?keyword=graph+analysis+lab+earth+science+answer+key PDF link annotation
    • http://shop-onlinediscount.xyz/d_martyn_lloyd_jones_audio_sermonshqsm0.pdfIn PDF document text
    • http://help-mediasupport.com/vevufexdllvg.pdfIn PDF document text
    • http://grusha.space/fipifejklwv.pdfIn PDF document text
    • http://uptodate.site/sat_practice_test_7_scoring1wmpi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460057/normal_5ffe15588383e.pdfIn PDF document text
    • http://help-service-support.com/tozodus889w9.pdfIn PDF document text
    • http://all-casino.xyz/vetibixogitutaxumikeb1oei.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370265/normal_5fe580205dd7f.pdfIn PDF document text
    • http://com-servers.online/girl_from_ipanema_stan_getz_transcriptionw8126.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488339/normal_5fef35adbfe22.pdfIn PDF document text
    • http://myimperfectmomlife.com/injury_report_patriotsp73z2.pdfIn PDF document text
    • http://datab.vip/space_marshals_apk_obb_modeaij9.pdfIn PDF document text
    • http://buloshnaya.site/fulujenafoxili0dqxr.pdfIn PDF document text
    • http://rodina38.ru/77656760318jh0iy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374698/normal_606395288c001.pdfIn PDF document text
    • http://rezonansmusic.com/how_to_update_my_garmin_echomap7fi47.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487662/normal_5fe49aa8c7940.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8eabb851-e103-4482-9421-f9fb76c0b1c6/91608280701.pdfIn PDF document text
    • https://s3.amazonaws.com/gavexilatuvitaz/42813128346.pdfIn PDF document text
    • https://s3.amazonaws.com/minabiwa/69265047226.pdfIn PDF document text
    • https://s3.amazonaws.com/kavifunaruvi/28358071594.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b3bbe0d-f314-4be0-bf7d-3f56454bac41/jitivukakabubunujewabo.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/lopisabibonemajimuna.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4445e7ed-33ee-48ab-9b78-7d303fe0a879/zaruba.pdfIn PDF document text
    • https://s3.amazonaws.com/penefelomiju/32729530600.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCB 5448 bytes
SHA-256: 735fa1438736a9443ad72c93308034d0f1912f23a4f5890a4569fc3a662f0870
font_01_sfnt_off0000f264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF264 11148 bytes
SHA-256: 52cf1b5be8636102fedff1b2eb4adc57808f43fdd252eb05061233fa16ff965d
font_02_sfnt_off0001183a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1183A 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15