Malicious PDF — malware analysis report

Static analysis result for SHA-256 d58e50399dd216ec…

MALICIOUS

PDF

91.4 KB Created: 2021-01-28 22:18:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: c6e1efe1d8301ae6d5e3b244c5ed1cb2 SHA-1: 3dff1b370fc4bffff6937efdbc1ba01492fe3f68 SHA-256: d58e50399dd216ec02ebe2aa4dc96aa6e8f2574235d07bdf27307c358f9e7c2f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many hosted on disposable domains, and is flagged by ML classifiers and ClamAV as malicious phishing content. The document body, though heavily obfuscated, suggests a lure related to a service manual. The presence of embedded URLs indicates an attempt to redirect the user to malicious sites, likely for credential harvesting or further payload delivery.

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://maypoin.ru/aws?utm_term=avision+ad240+service+manual PDF link annotation
    • https://funogefoxareso.weebly.com/uploads/1/3/4/0/134041001/kagupipukalaner.pdfIn PDF document text
    • https://mafobosapufi.weebly.com/uploads/1/3/4/5/134505980/6e740ed3ab.pdfIn PDF document text
    • https://foxejakepi.weebly.com/uploads/1/3/0/8/130874264/memap.pdfIn PDF document text
    • https://nodemudikukurev.weebly.com/uploads/1/3/5/3/135348567/3578763.pdfIn PDF document text
    • https://xelixexojiga.weebly.com/uploads/1/3/4/1/134108676/sifawuwujuxup.pdfIn PDF document text
    • http://airet.space/dead_zombie_sniper_frontier_2018_hackbtzab.pdfIn PDF document text
    • https://nodokesomizi.weebly.com/uploads/1/3/4/6/134656280/vaxuzawimuwep.pdfIn PDF document text
    • https://jakugogafezokev.weebly.com/uploads/1/3/1/4/131437362/4736936.pdfIn PDF document text
    • http://gladkoe-telo.xyz/fudejavesipitobovelqytrv.pdfIn PDF document text
    • https://valojeruxul.weebly.com/uploads/1/3/4/6/134681631/7f48a61d.pdfIn PDF document text
    • http://shoop-fk.ru/3d_heart_mobile_craft6xzv1.pdfIn PDF document text
    • http://islemleriniz.org/stellaris_administrative_operationsahmf3.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tokafanawa/yahoo_mail_for_apple.pdfIn PDF document text
    • https://s3.amazonaws.com/fexuror/bayer_ag_annual_report.pdfIn PDF document text
    • https://s3.amazonaws.com/kofabube/picsart_apk_premium_ios.pdfIn PDF document text
    • https://s3.amazonaws.com/safenalavojuwu/41914053414.pdfIn PDF document text
    • https://s3.amazonaws.com/fosawef/employee_acknowledgement_form_sample.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://www.gnu.org/licenses/gpl.htmlIn 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
stream_003_off0000fb67.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFB67 15752 bytes
SHA-256: 195b6b5ed69982348ff6f7c509e0ea55c9a230bcbf4eec983b5ca9819fafdc0a
font_00_sfnt_off0000e8c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C8 5496 bytes
SHA-256: 2cbdd672672bfc18392d3582f74f2d112e538bb5ca1d5eae6c6729b09b1717c4
font_02_sfnt_off00012694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12694 10384 bytes
SHA-256: 1011b171992fbd1446b4b7cd2da927351539f8d41812d93ccc13cefe7446f843
font_03_sfnt_off00014a30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A30 16348 bytes
SHA-256: 2334ade245ec46eaa3943be3e15553e8ac07f98e23f092e9c17c46eab61462e4

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