Malicious PDF — malware analysis report

Static analysis result for SHA-256 03d8ca86447ac261…

MALICIOUS

PDF

81.9 KB Created: 2021-09-08 22:24:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 346e3d591c49003e1cf5a03ddbde2e06 SHA-1: d9169d371325f7b4e5ebf5c18e87c9d92086f914 SHA-256: 03d8ca86447ac26172fb64706d6cd48ab328e1f91f39de7de281115728b7b90c
194 Risk Score

Malware Insights

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

The PDF file exhibits multiple indicators of malicious activity, including links to algorithmically generated URLs and IP addresses, as well as being flagged by ClamAV as a phishing trojan. The presence of numerous external URIs, some hosted on disposable domains, strongly suggests an attempt to lure users to malicious content or download further payloads. No scripts were extracted, but the overall structure and heuristic firings point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 https://smidgel.ru/uplcv?utm_term=english+movies+watch+online+with+english+subtitles PDF link annotation
    • http://cudicio.it/images/file/45152908721.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/kowidotitejusajomerowuze.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/90326916779.pdfIn PDF document text
    • https://dukeofmarshall.com/ckfinder/userfiles/files/18050174560.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/zenob.pdfIn PDF document text
    • https://coil.hk/upload/files/bitefewewirixewan.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/74227069438.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/13685323814.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/juvipebitonubobudolozasos.pdfIn PDF document text
    • http://shopcloud.cloud/ckfinder/userfiles/files/72933147983.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fefd4d2bf1---8222657746.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/82408387420.pdfIn PDF document text
    • http://usa-ex.com/images/blog/file/tidogu.pdfIn PDF document text
    • http://carbontuning.ru/file/kowexavojobi.pdfIn PDF document text
    • https://skywaynepal.com/userfiles/file/89468593792.pdfIn PDF document text
    • http://idevicesplus.nl/app/webroot/files/userfiles/files/86457314101.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/gurusisu.pdfIn PDF document text
    • http://chixue.com/uploadfile/file/20210902053457.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/xilun.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/50463262124.pdfIn PDF document text
    • http://vanprodukt.cz/UserFiles/File/17987383840.pdfIn PDF document text
    • http://phupmirpol.pl/userfiles/file/totaxesag.pdfIn PDF document text
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/nedar.pdfPDF link annotation
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/xawawotifilagoludere.pdfIn PDF document text
    • 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_off0000d9da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F1 10952 bytes
SHA-256: 61b40dfc39851c9dda732f5d26286828da109393f9ca68091532ea246669c249
font_02_sfnt_off00010b31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B31 17788 bytes
SHA-256: 1e32d7d43f6c4085c8ae4fe0d68d2765e3554bd720210c2f68377f65e7d80623

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