Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c343ce25cb09c5b…

MALICIOUS

PDF

82.5 KB Created: 2021-09-11 23:36:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 038b982139a5ba94c81b8063022a2139 SHA-1: 89fc3206d6e9cfe1a326be10d176ce2a672b323e SHA-256: 9c343ce25cb09c5bfcca595d6fdcf468534af218da1f792dbb5ebd4d4c354445
134 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable hosting. The presence of a 'download button' heuristic further suggests a lure to download a payload. No scripts were extracted, but the numerous embedded URLs point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ducthanhtam.com/uploads/userfiles/file/satuw.pdf In PDF document text
    • https://servingltda.com/userfiles/file/92447710348.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/45760708111.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/65300027601.pdfIn PDF document text
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/bivumasejenovix.pdfIn PDF document text
    • https://nasco-ye.com/uploads/file/6084713753.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210902_7C1D1515413EA239.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/wevejorefevenej.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/koxezoxaj.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/35561317100.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f96a8a1d39---radazobuwoji.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/tixuxovopigogi.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/safugojumixosasit.pdfIn PDF document text
    • http://quinta.cl/upload/files/wawajazi.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/45294627797.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/wobajepiforugovo.pdfIn PDF document text
    • https://zhongzing.com/uploads/files/202109062153331098.pdfIn PDF document text
    • http://radtel-sport.pl/userfiles/file/vuzotevidewukatebak.pdfIn PDF document text
    • http://youzedu.com/ckimages/files/20210911205259146911.pdfIn PDF document text
    • https://kubermatkaplay.com/ckfinder/userfiles/files/molasixoroxedojesagir.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/liwoliwobibix.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/dexorasol.pdfIn PDF document text
    • https://kangaroovietuc.vn/webroot/img/files/genum.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/22747100108.pdfIn PDF document text
    • http://irodaszer.lukinserv.hu/file/33290066349.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=latest+android+version+for+samsung+tab+2PDF 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_off0000dbe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE6 11032 bytes
SHA-256: 7050d60982bb4fe6995676316cec45dac5eb8ffbbd71a4bb6499d2c40ba6cbee
font_01_sfnt_off0000f572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF572 18088 bytes
SHA-256: fb169e262e69df162f8b783ae7cb19352dc1a1e2540cab9fca77c46b3b0829b5
font_02_sfnt_off00012451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12451 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1