Malicious PDF — malware analysis report

Static analysis result for SHA-256 6315165e9ce28a3f…

MALICIOUS

PDF

79.3 KB Created: 2021-09-11 01:03:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: db6718a4d18599d72eb1852fe637deca SHA-1: 7c08773bcc8a364ebbf6de88b358e35822678147 SHA-256: 6315165e9ce28a3fe0eb2e575df74042e3c6d96780a8c608340abf80e67df5e1
126 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, presenting numerous links to external PDF files, likely as a lure to download further malicious content. The presence of multiple embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613247fbc7303---degego.pdf In PDF document text
    • https://officialbacknumber.org/editor_up/28697904100.pdfIn PDF document text
    • https://zlato-invest.cz/upload/files/pitupuvimunokazina.pdfIn PDF document text
    • http://aquatherm-graz.at/files/romoguxurokidogalekedaw.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0cd23aff7---xoxavetuwabibilej.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/68096884304.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/junagixot.pdfIn PDF document text
    • http://xn----8sbfhu6ab4bqv.xn--p1ai/userfiles/file/muzinesuwobavuvuw.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/49607628259.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/lajivijekop.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/41093407353.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/dasilobitemulemek.pdfIn PDF document text
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/13798920079.pdfIn PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/9256588200.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/18669256716.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/22081046555.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/ujafudevarez.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/kulufasogafevapusutadipix.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/gixedokip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=sims+4+android+apk+modPDF 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_off0000d533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD533 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4A 10524 bytes
SHA-256: f9eac14a16c3f936f0eff1adeb4224135f5da695a1f502663fcf0960f4d0df6e
font_02_sfnt_off00010527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10527 16460 bytes
SHA-256: 0e641348d20752d714cc3cd25c8a8673d409d068cdf89da092cac842824c9d28

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