Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc079d0d935574f8…

MALICIOUS

PDF

68.6 KB Created: 2021-09-30 19:26:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ef74a957fae025ead05b2c42717946d4 SHA-1: 57a3aa6c9c1b6d0e33ccb091604b6d84d1f6f244 SHA-256: bc079d0d935574f885814f59ce544e02d37122d00d11bcba666a3eb057286b9e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The presence of numerous external URIs, many hosted on disposable domains and employing UTM parameters, strongly suggests a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and URI patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://synerhu.ru/uplcv?utm_term=android+11+launch+date+in+india PDF link annotation
    • http://gekon.net/userfiles/file/nijatik.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-4/20210904202512847175.pdfIn PDF document text
    • http://quesnelbusinessnetwork.ca/userfiles/file/jijonesufejafiwora.pdfIn PDF document text
    • http://baovekhucongnghiep.com/upload/files/69260876338.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/93367661412.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/34429533439.pdfIn PDF document text
    • https://ccs-corporation.com/ckfinder/userfiles/files/91373397227.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/2915460484.pdfIn PDF document text
    • http://theprofitnesstrainers.com/userfiles/file/ratalenituxafo.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/davobogomowariwaxob.pdfIn PDF document text
    • http://cl-pub.com/files/files/zofofi.pdfIn PDF document text
    • https://virker-ikke.dk/files/xejetite.pdfIn PDF document text
    • http://systempro.kr/userData/board/file/92726343528.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/69149348825.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/a7hmu017n2gfsd8lovoqh3c187/59348350088.pdfIn PDF document text
    • https://mirrorlink.com/public/files/files/45010766296.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/jesapomapiboxawa.pdfIn PDF document text
    • http://zenpersonnel.com/UserFiles/file/ditewasamutakalidupas.pdfIn PDF document text
    • https://transdeliveris.lt/userfiles/file/demagofesubalugofima.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/cila9oariivsidahjie3vs1oke/27293288902.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/71148405359.pdfIn PDF document text
    • http://perfecturology.cafe24.com/upload/editor/imagefile/medumofewoxuxutidewan.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_off0000af94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A6 14932 bytes
SHA-256: 45efe27d6a42a2fa260d5c16c05b8e0de09b64676b983d613cd2b71d12255b41
font_02_sfnt_off0000ed3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3B 10432 bytes
SHA-256: 7da50c76e1548736725f219d1729e67a793438355b772614891f6e5206ee92f4

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