Malicious PDF — malware analysis report

Static analysis result for SHA-256 a19fccabe35c18ae…

MALICIOUS

PDF

69.8 KB Created: 2021-09-25 10:48:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ecd16646597f262ba43f4aed2d03db2c SHA-1: 99a9cd56f68c0cfa47e19f727f9c7a95233b9015 SHA-256: a19fccabe35c18aeb7da52b1f63f4a8d506e750d537b39c4ffe57fadd42f8062
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. The presence of a malformed exploit stream and ML classification strongly suggest malicious intent, likely for phishing or malware delivery. While no scripts were directly extracted, the PDF structure and embedded links are indicative of an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://telekommarketing.com/firme_data/files/fetaditamupagizefomuzixe.pdf In PDF document text
    • http://theurbanbazzaar.com/userfiles/file/10443615011.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/zularodoseduzovazira.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/79787008599.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/35797734084.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/nubamuzonukiwosokubuto.pdfIn PDF document text
    • https://fasleh.net/Files/files/99852076441.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/57937502557.pdfIn PDF document text
    • http://pyhunlian.com/uploadfile/file/jetogoxusaperituloru.pdfIn PDF document text
    • https://aqua2go.pl/galeria/file/74299081001.pdfIn PDF document text
    • http://myslizdrave.com/soubory/76631618189.pdfIn PDF document text
    • http://livestocktool.com/d/files/demukirozizimaguvifugoz.pdfIn PDF document text
    • https://preciseenergygroup.com/media/87229920395.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/wozopi.pdfIn PDF document text
    • http://hermandadperdon.es/userfiles/file/jewureginojugimizubopiv.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/dubuxiwazugiw.pdfIn PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/49374614492.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/naxunefurepimaxazenujo.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/vodubukafibuxunofokabup.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e1010a3e2a---46009454715.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/57450501917.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b50264e3d5---rixonediweruvi.pdfIn PDF document text
    • https://activsport.ro/userfiles/file/19312215690.pdfIn PDF document text
    • http://cuanhuadanang.vn/uploads/image/files/xuwewumalamanumaxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=who+invented+the+shot+clockPDF 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_off0000b1dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9EF 15856 bytes
SHA-256: 0ba05b7b8d2d12bc8cd213c301dd50814b7d09f43dcd68a77df4c25e918652ca
font_02_sfnt_off0000f207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF207 10356 bytes
SHA-256: b016d81771a45dbdf762f948e486ace6dfa499f28495818e455ff5ac95994796