Malicious PDF — malware analysis report

Static analysis result for SHA-256 c45b3ad1c6362215…

MALICIOUS

PDF

72.9 KB Created: 2021-03-24 17:07:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1c7f7f1a022150a491f102cba8ce8e9e SHA-1: 8fcd59c9851dea6fc59a3d35fd9ed73de7298d4a SHA-256: c45b3ad1c6362215fc24ed70b5373f8b0702387586a70c3b44cf0db7b7286026
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 0.9998

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://jacksth.ru/award?keyword=professional+responsibility+and+accountability+in+nursing+pdf PDF link annotation
    • https://novomuzedideb.weebly.com/uploads/1/3/1/4/131406537/mebelofe-ridubalapusatug.pdfIn PDF document text
    • https://cdn.sqhk.co/kerametunal/EigWhbv/save_rock_and_roll_guitar_chords.pdfIn PDF document text
    • https://wumefabifu.weebly.com/uploads/1/3/4/8/134888429/8277530.pdfIn PDF document text
    • https://gapurosudezejug.weebly.com/uploads/1/3/5/9/135965954/992fe.pdfIn PDF document text
    • https://komuwewolidixat.weebly.com/uploads/1/3/4/8/134871085/fifumureletomi.pdfIn PDF document text
    • https://cdn.sqhk.co/gujipiror/507iagc/45859771265.pdfIn PDF document text
    • https://wevobuge.weebly.com/uploads/1/3/5/9/135978380/dodeseso_kopebibije.pdfIn PDF document text
    • https://wazawuxara.weebly.com/uploads/1/3/4/7/134762715/wigomiganububo.pdfIn PDF document text
    • https://serirufudo.weebly.com/uploads/1/3/4/7/134712976/nukigonomefel-gitufi.pdfIn PDF document text
    • https://gupobotinifetex.weebly.com/uploads/1/3/4/3/134338345/42fec2ed2a.pdfIn PDF document text
    • https://sixumegeb.weebly.com/uploads/1/3/4/4/134476160/xofegejupav_papoduvinulagov_lutojakedas.pdfIn PDF document text
    • https://nadatipaj.weebly.com/uploads/1/3/5/3/135347779/didafudalazefaximup.pdfIn PDF document text
    • https://rapelolizoxofi.weebly.com/uploads/1/3/1/3/131381924/zetajupatisezi_redel_dokenaso.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://eeff404e-5492-4914-a1d7-e39d1f35e6b2.filesusr.com/ugd/e58d70_95afc91b6c2b4bc48b6257d6d684e7a7.pdf?index=trueIn PDF document text
    • https://fab88ded-2f12-46c9-b6ec-f290036286cc.filesusr.com/ugd/cce69c_b82fcbd524554afd9d52472402a832da.pdf?index=trueIn PDF document text
    • http://misukejijixuke.epizy.com/officejet_2620_datasheet.pdfIn PDF document text
    • http://mezifaxura.rf.gd/left_right_center_dice_game_walmart.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_off0000dee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE4 5564 bytes
SHA-256: 24ba13492f37707cde119776092fc743eb3ed69f657893cd67cc99b082b929d7
font_01_sfnt_off0000f1e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E2 10140 bytes
SHA-256: 3fb2b7ef835382b08ffccf4fffba1d477d69957622fa38bd8acc6857c4238c3e

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