Malicious PDF — malware analysis report

Static analysis result for SHA-256 392d44a7060c3af8…

MALICIOUS

PDF

87.3 KB Created: 2021-09-19 05:31:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 39db979ef883c893237c4fbd57b97e96 SHA-1: aa39d641cd0966e53ed344a7f4a09c8fecd29b0c SHA-256: 392d44a7060c3af8177c0aa8619c11dbb04ed97a233e60b1c8e124209e6b7292
174 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating it's a Pdf.Phishing.Trojan. It contains embedded JavaScript and numerous external URLs, suggesting it's designed to download and execute a second-stage payload. The heuristic 'PDF_RANDOM_URL_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further support its role as a distribution mechanism for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://irlanc.ru/uplcv?utm_term=hungry+shark+evolution+pc+download+windows+7 PDF link annotation
    • http://jodhpurheritagewalk.com/images/file/miwavepuvafol.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/8273032074.pdfIn PDF document text
    • http://pandoraecza.com/genelresimler/file/13455432777.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/44753989979.pdfIn PDF document text
    • http://zoscm.zohukum.com/ckfinder/userfiles/files/xejexogikasi.pdfIn PDF document text
    • http://www.de.ruben.pl/ckfinder/userfiles/files/jonifak.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/61653332970.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__6132D724EFBC1.pdfIn PDF document text
    • http://full814.com/upload/files/rogixodi.pdfIn PDF document text
    • http://juentai.com/userfiles/files/11498055031.pdfIn PDF document text
    • https://hainutedecopii.eu/ckfinder/userfiles/files/lakogesimemamodor.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408d7547203---pivuverun.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/tikakavorejagepuno.pdfIn PDF document text
    • http://kirche-treuen.de/UserFiles/File/pegabufewumekibolabo.pdfIn PDF document text
    • https://laznia-radom.pl/userfiles/file/megenitigawow.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/kapededotujevujanewazu.pdfIn PDF document text
    • https://tectrongim.com/uploads/file/rebuxajuzumupet.pdfIn PDF document text
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/36660477398.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/diragirovodedefira.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/56253361688.pdfIn PDF document text
    • http://flyingfish-stay.com/userfiles/file/4323699813.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/segemuvetakefumipoboxupa.pdfIn PDF document text
    • http://mywayrtk.org/userfiles/file/31756156648.pdfIn PDF document text
    • http://fohow77.ru/upload/file/77558805936.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_off0000ede3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FA 11292 bytes
SHA-256: dcc1308f4a9ca8b78b3b4c46fbf10893e94ef0b6ab1c82768c5eefc4ca1fefcb
font_02_sfnt_off00012052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12052 18216 bytes
SHA-256: ddeaa8e7ab106630ebe587d88441ad3b1b88c5c466682e778531fdf08956bf99