Malicious PDF — malware analysis report

Static analysis result for SHA-256 defbe9508982354f…

MALICIOUS

PDF

73.0 KB Created: 2021-01-28 22:02:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 5d8637567e7857953dddfe43f1b63a30 SHA-1: 49e2c7e9ae61b711521fc1e37e427506652871ee SHA-256: defbe9508982354fbc0057824a665071b65e30d193394483c6d42365e2e238e7
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, with numerous embedded URLs pointing to potentially malicious sites. The document body appears to be malformed or obfuscated, but the presence of many external URIs strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crophysi.ru/123?utm_term=owl+food+web+worksheet PDF link annotation
    • https://boxuvudadutubip.weebly.com/uploads/1/3/2/6/132695546/pedonisabepizul.pdfIn PDF document text
    • https://muluxebaxomoj.weebly.com/uploads/1/3/5/4/135401331/d2f57.pdfIn PDF document text
    • https://megigoxifiwovom.weebly.com/uploads/1/3/0/7/130740625/zenuvawutos.pdfIn PDF document text
    • http://idealica-italiauficiale.website/53296672950ci5qd.pdfIn PDF document text
    • https://rorezumi.weebly.com/uploads/1/3/4/5/134591247/patoz-damekadexawos.pdfIn PDF document text
    • http://hookup157.online/6_speed_manual_transmission_motorcyclegvgqq.pdfIn PDF document text
    • https://supagerafigi.weebly.com/uploads/1/3/0/8/130874211/7515981.pdfIn PDF document text
    • https://dorenezawux.weebly.com/uploads/1/3/5/3/135383086/xisizarado.pdfIn PDF document text
    • https://gixakipero.weebly.com/uploads/1/3/1/4/131412713/ebac3.pdfIn PDF document text
    • https://duxoberadu.weebly.com/uploads/1/3/4/7/134718286/7059838.pdfIn PDF document text
    • https://zomerasojukoluw.weebly.com/uploads/1/3/4/7/134769652/pobaj-bikaj-samixivepa-likenamopuxigi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pivutabomenatam.rf.gd/letter_tracing_workbook.pdfIn PDF document text
    • https://s3.amazonaws.com/rakabexozu/volugixotewatazerejedizug.pdfIn PDF document text
    • http://kefujaforu.rf.gd/figamizuwidejadepogomozu.pdfIn PDF document text
    • https://s3.amazonaws.com/takateg/excel_vba_copy_cells_with_formatting.pdfIn PDF document text
    • https://s3.amazonaws.com/gurupixabogivaz/lofagivugidukulej.pdfIn PDF document text
    • http://magivaxinel.rf.gd/android_studio_emulator_review.pdfIn PDF document text
    • http://gusozafameximi.epizy.com/35006694196.pdfIn PDF document text
    • http://nijetazum.epizy.com/70_s_soul_music_s.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e05b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05B 5108 bytes
SHA-256: 34252faa0789fea04b72259c87e0605ade2f5680ef83ea9a56cfced59e9475f2
font_01_sfnt_off0000f1c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C9 10936 bytes
SHA-256: a14e0d5e05589011ac29e48ca6e1460f8efaba89f99cb5b982d1d6a23d35d621

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