Malicious PDF — malware analysis report

Static analysis result for SHA-256 a16ba9f7eca88028…

MALICIOUS

PDF

76.5 KB Created: 2021-09-23 23:33:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1f3307857665a335938a2e535218f8f7 SHA-1: c1b2fe65a437ea2a6205b0ba91910f240120ddc7 SHA-256: a16ba9f7eca88028787a6940b8b446687eeffef07dfebb193dd7d13cf91ccd1f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document's purpose is to host numerous links to external PDFs on potentially disposable domains. While no scripts were explicitly extracted, the presence of external links suggests a potential for downloading further payloads or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://successalpha.team/upload/files/zudizobebewilegazuwo.pdf In PDF document text
    • http://boletin.alicantehosteleria.com/lib/ckfinder/userfiles/files/pufefe.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/mewufagunimegepopaz.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/88780227731.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/nokadiletide.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/visaj.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/dijejotalanurapulejofik.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/junezililujumuvelosemal.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/40092287494.pdfIn PDF document text
    • http://nbc.com.vn/ckfinder/userfiles/files/25981326854.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vejedopo.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/57740629413.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/46508489926.pdfIn PDF document text
    • http://tabletopad.com/images/file/pakuvipipi.pdfIn PDF document text
    • http://universalthailand.com/images/uploads/ckfinder/files/tatezodivedepakiborag.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/23530901350.pdfIn PDF document text
    • http://martonelektro.hu/files/file/tajolimoduzoguluwopatimi.pdfIn PDF document text
    • http://tdbm.vn/upload/files/38147687232.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/69864867450.pdfIn PDF document text
    • https://beytarimcilik.com/admin/editor_resim/file/79520791153.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/33043443815.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=download+eat+that+frog+book+pdfPDF 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_off0000c355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC355 10836 bytes
SHA-256: b348740a4a7e199ffde1734ac560e8c01a34f480577675abe4cebb8f84243d97
font_01_sfnt_off0000dbe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F6 19180 bytes
SHA-256: 7a5675047b41f5f844bad726fd4e53d6148bf503410805f1470702619307bf42

Open this report in the interactive analyzer, or submit your own file for analysis.