Malicious PDF — malware analysis report

Static analysis result for SHA-256 a443b9744bd7c19e…

MALICIOUS

PDF

68.3 KB Created: 2021-09-30 21:11:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ed6b9a93d69ddf297773bd243a70f247 SHA-1: 81a9309a3e21ae5650c55fce258c4d3242cb5268 SHA-256: a443b9744bd7c19e43529a66a8384ea3d714adfd6f7f5dc3977f0e3414812a98
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file exhibits characteristics of a phishing lure, including being image-only with a click-outward action and hosted on disposable domains. Heuristics indicate malformed streams and external URI usage, suggesting an attempt to exploit vulnerabilities or redirect users. The presence of numerous URLs, many on suspicious domains, further supports a malicious intent, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 7

  • 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.
  • 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 68 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 https://garglob.ru/uplcv?utm_term=watch+anjaam+pathiraa+with+english+subtitles PDF link annotation
    • https://newtop-eg.com/userfiles/file/badupanotolidutitidogud.pdfIn PDF document text
    • https://sukaunited4d.vip/contents/files/71935599511.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/3207608721.pdfIn PDF document text
    • https://5udua.com/contents/files/62461401355.pdfIn PDF document text
    • http://clubselectionvoyages.net/images/file/bezazowagi.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210921073656.pdfIn PDF document text
    • https://dcimx.com/files/99821249614.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/77029550167.pdfIn PDF document text
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/71702353867.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/duvulifupidafi.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/raliroxipasuxefipofomab.pdfIn PDF document text
    • https://dalba.net/other_files/File/49757101756.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614341a27b29d---12786457862.pdfIn PDF document text
    • http://svenskafik.se/uploads/fckeditor/file/13119937870.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/96867666426.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///11309993921.pdfIn PDF document text
    • http://jj-metals.com/userfiles/file/2021090513442873499.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/3446073889.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/34781546c34636b83f8518c9c808f876/80113145772.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/xezorigagizuvipafav.pdfIn PDF document text
    • http://mebco.ru/images/file/5491148878.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/bemulepawadakuxavidefezuz.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/99887640144.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_off0000ae12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC624 14420 bytes
SHA-256: 02bb392c107f058c7f62c61618f73609d3cc5e0b89c79e00fe64c106233bc3a7
font_02_sfnt_off0000ea0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0A 11152 bytes
SHA-256: a0d20e7fcf9343f25aaef919d68131b1b98a83e2bc688bdd4b2c78dd20620034