Malicious PDF — malware analysis report

Static analysis result for SHA-256 826f4dbb71ea42e7…

MALICIOUS

PDF

82.9 KB Created: 2021-09-17 02:02:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 52e215cf0c8912aa57902bee481a60a1 SHA-1: d5bedeb196a8331d5dc2d24f63399847b71e9852 SHA-256: 826f4dbb71ea42e7ba11efc86e5b11e2d016dcd4550b0ff2f32473f3a718a154
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a high number of distinct hosts and links, characteristic of phishing or malware distribution infrastructure. No scripts were extracted, but the structure and URL patterns suggest an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://partnercable.com/files/jomorenaxuwabopadejul.pdf In PDF document text
    • https://oncetrabzon.com/resimler/files/nenitotaziduk.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/74667002281.pdfIn PDF document text
    • http://terminsk.by/pics/files/kolinatudofitezuvuxopek.pdfIn PDF document text
    • https://haciendaloscipreses.cl/upload/file/53595071439.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/89048214080.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/vewitozabaguxogiwunita.pdfIn PDF document text
    • https://ultralloy.net/upload/files/nezaragugilusabusi.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/gulezixaxoj.pdfIn PDF document text
    • http://t-cso.com/upload/file_folder/file/pemositedaseleside.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210902060859.pdfIn PDF document text
    • https://rezilta.com/psum/admin/userfiles/file/96787094388.pdfIn PDF document text
    • http://xnucleus.com/members/member_images/files/78077610143.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/161403bbb45f57---butabavuvoxebumupapagax.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/tagazuxipigalem.pdfIn PDF document text
    • http://aurastaffing.es/upload/file/26117457809.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/wasitezubumeziw.pdfIn PDF document text
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/jutexinurut.pdfIn PDF document text
    • http://gestioniarmatoriali.it/piwijudidedusitebelazo.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/vigipefitivuwuro.pdfIn PDF document text
    • http://heathrowairporttaxi.website/userfiles/file/56503078230.pdfIn PDF document text
    • http://sdes.in/uploads/31616894328.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=wolfgang+amadeus+mozart+instrumentsPDF link annotation
    • 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://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_off0000dd88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f59a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59A 18708 bytes
SHA-256: 35f5d0e9b2a489825648611bc3a146fcd9a779ed78e5339706fc241f40673a0f
font_02_sfnt_off0001253b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1253B 10852 bytes
SHA-256: 58833bc3bbc95b79fda84dd8b35cd419a20d0e3915595c5de4056299f04f98db

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