Malicious PDF — malware analysis report

Static analysis result for SHA-256 45afcd282f73a2cf…

MALICIOUS

PDF

67.7 KB Created: 2021-10-05 03:06:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: dc6cd55d084005db8bdd84dd3d7f1046 SHA-1: 94113f9336f75797bf41353e693d350b28d4dc46 SHA-256: 45afcd282f73a2cf0ed2b2a43704f6cab4d00e77476dafe8e882e3b731929525
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF is identified as a phishing lure due to its small size, image-heavy content, and embedded clickable link. The heuristic 'PDF_IMAGE_LURE' indicates a typical phishing shape where a screenshot hides a button to launch an attacker URL. Although no scripts were explicitly extracted, the presence of numerous embedded URLs, many of which are hosted on potentially disposable domains, suggests a link farm designed to redirect users to malicious content. The ClamAV detection further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/663607de8e4d46138b759ca6045e79a7/36241344483.pdf In PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/5283040474.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/durul.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/33793547137.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/zuludolobasuj.pdfIn PDF document text
    • http://wsospice.org/uploads/userfiles/file/file/rebufubuxiju.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/pikigurezomevesebu.pdfIn PDF document text
    • https://crbz.ru/userfiles/file/navapavowujunokurukiravo.pdfIn PDF document text
    • https://tectrongim.com/uploads/file/dejunimav.pdfIn PDF document text
    • http://www.kigimex.com.vn/ckfinder/userfiles/files/xetimugawepagopu.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1631472507.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/fenopikedosukodepu.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/10384978888.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/bisinopugemelusagebi.pdfIn PDF document text
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/rupozofajusozafemigaxepe.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/vijavumovosepagomi.pdfIn PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/78543954102.pdfIn PDF document text
    • http://yurisolomko.com/userfiles/file/libonoteb.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/8960786800.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/b583a9ed28ab98138ced8fb69f605fd7/molewovapilateboz.pdfIn PDF document text
    • http://satcomlink.com/userData/board/file/davipunapadijaw.pdfIn PDF document text
    • http://rm-centr.ru/uploads/file/fijepumikon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=adult+daily+calorie+intakePDF 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_off0000b04b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB04B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c85d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC85D 13628 bytes
SHA-256: f7003b3aad71b84ac9ed63f1576b91aa5441cf556f3859c50a3d399af5b5a54b
font_02_sfnt_off0000e987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE987 10484 bytes
SHA-256: 7157531d137317ec68273b539aae518d2aa29255324eafcb42781fb915400157