Malicious PDF — malware analysis report

Static analysis result for SHA-256 576f787edfa421f7…

MALICIOUS

PDF

78.8 KB Created: 2021-09-18 02:17:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4888186495631fdb30de58848e11c3bd SHA-1: d4f06fb961cdf1b3a35b03c28735dbd0a7a6822d SHA-256: 576f787edfa421f78fb61a71dffd03c2cb3b8d73cf72f3902a0f255ee00d8aa2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's used to redirect users to malicious sites. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://smidgel.ru/uplcv?utm_term=virgin+media+apn+settings+android PDF link annotation
    • https://geneolock.com/locktactyuma/userfiles/file/rotugobasot.pdfIn PDF document text
    • http://colantuono.it/userfiles/files/46616769365.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/kafagerinewelusaroduzij.pdfIn PDF document text
    • http://thietbianninh188.com/uploads/files/tevolonidadofo.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/13089469556.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/mabitabijumamafora.pdfIn PDF document text
    • http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/34390298753.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/xafakoxadafit.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/27402198482.pdfIn PDF document text
    • http://kunmobile.vn/files/uploaded/20210908/file/43961415157.pdfIn PDF document text
    • http://www.likoda.com.tw/upload/ckimg/files/86749677562.pdfIn PDF document text
    • http://lifeline-sports.com/files/file/42606274904.pdfIn PDF document text
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/minikolesijuxofefoxotegam.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/98804037617.pdfIn PDF document text
    • http://vita24h.com/uploads/userfiles/file/12775816310.pdfIn PDF document text
    • http://childprotectionindia.com/lexcyberia/userfiles/files/88650782971.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/98063890282.pdfIn PDF document text
    • http://demkapi.com/resimler/files/14668496563.pdfIn PDF document text
    • http://tw-jia.com/uploads/files/202109070624208757.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/tesalabedofip.pdfIn PDF document text
    • http://quaint-house.com/images/blog/file/96168134251.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/In PDF document text
    • http://mintaialuminum.com/d/files/xulutuledunebo.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://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_off0000cecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCECF 18008 bytes
SHA-256: 1d3d1b6b7a21bb28639db2e3d335a3f832026f5aed7a2c19849db928d38911b0
font_01_sfnt_off0000fdc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D8 10656 bytes
SHA-256: b044dde537eaa232f9344a67f916f7d73a202140e6be868bd6f85aa3ca1edf50

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