Malicious PDF — malware analysis report

Static analysis result for SHA-256 368dccdd27a2f96b…

MALICIOUS

PDF

82.1 KB Created: 2021-09-23 04:01:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 221014c17dc01a31b7d4009327c75b6a SHA-1: a19ee09f93e4ac89a607b859078e2f0a3ae6ddab SHA-256: 368dccdd27a2f96b8b3a11b6998ddc0e0d53855e64723b41835a5d1366b17bbf
134 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to various external PDF files, one of which is hosted on 'haiqi-machine.com'. The presence of a 'download button' heuristic suggests a social engineering lure to trick users into downloading malicious content. No scripts were extracted, but the overall structure and URL findings point to a downloader or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://haiqi-machine.com/d/files/fagizilazuzusiranepexa.pdf In PDF document text
    • https://kcss.hu/korosi/userfiles/file/nopare.pdfIn PDF document text
    • https://mediaskills.rs/files/gawikotazupadovilogi.pdfIn PDF document text
    • http://hondaototanan.com/upload/files/xaduxowituwekavusivaji.pdfIn PDF document text
    • http://fastbeatbattlerider.saint-fun.com/assets/upload/files/58156908522.pdfIn PDF document text
    • http://visusmarble.com/images_upload/files/62943437632.pdfIn PDF document text
    • http://hidramaco.com/files/files/gevikelarevavamitanine.pdfIn PDF document text
    • https://perfumes.dropship-tracking.com/userfiles/files/nujulokuvob.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021910102277860.pdfIn PDF document text
    • http://gorillatheory.com/admin/upload/file/zogoxafa.pdfIn PDF document text
    • http://fatename.com/uploads/files/202109141133298086.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/xegotuxakinupibafelefup.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/namafaduxadovilijo.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/sepos.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/dakaro.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/29878533687.pdfIn PDF document text
    • https://beldapin.com/calisma2/files/uploads/15207267317.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c004bc50d6---nubidosowuvoxuwodukotisuj.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/balobabikokakagotojuvasem.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/pawebutebuvupepusonaro.pdfIn PDF document text
    • https://marsanz.pl/uploads/fck/file/84416444085.pdfIn PDF document text
    • http://epwuae.com/userfiles/file/83897784691.pdfIn PDF document text
    • http://travellerisland.com/files/47994648021.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210919095716.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/ropidafo.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/7739459770.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=five+nights+at+freddy%27s+3+apk+pcPDF 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_off0000d7ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AD 11188 bytes
SHA-256: 0ea388387559997168155c581d25097a231c7984bed4f57b4f4a2daf3494c4ca
font_01_sfnt_off0000f1b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B7 18636 bytes
SHA-256: 7963f5f7d0de9ec6a244ba0bad388ce8a4d743f7be18c023e13f2c81272f7240
font_02_sfnt_off0001223c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1223C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1