Malicious PDF — malware analysis report

Static analysis result for SHA-256 78bf1b323aecff32…

MALICIOUS

PDF

74.6 KB Created: 2021-09-10 18:16:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cf8bee5761c5ad0e4f62490421b6645c SHA-1: ec261ba07374aa15cff7ec9475bd90b753420e38 SHA-256: 78bf1b323aecff32ded839a364a21e087434135950c236ed98e0c9e2d5aa39fa
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 is designed to host numerous links on disposable domains, a common tactic for distributing malware or conducting phishing campaigns. While no scripts were explicitly extracted, the nature of the link farm suggests an intent to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/10e6dc9f7058b0adce0684bee2cdd05c/zoxazolaporababog.pdf In PDF document text
    • https://shipnhanh247.vn/asset/files/93014598948.pdfIn PDF document text
    • http://rsst77.ru/upload/files/67686190702.pdfIn PDF document text
    • https://badanie-wody.pl/galeria/file/31127325841.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/sevokizisal.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/bezutun.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/gowejegikopo.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/82757461783.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/geluduxaga.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/17380371150.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/2c5eac55a4870986f6e9a72b2eb96386/8253491961.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/14474646782.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109011312507035.pdfIn PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/wojaselat.pdfIn PDF document text
    • https://zhansq.cn/upload/file/1042568749.pdfIn PDF document text
    • https://kaparatt.com/images/File/mozajuvakor.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/92240097817.pdfIn PDF document text
    • https://epiphanych.com/images/file/favemalaxuta.pdfIn PDF document text
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/suvumufesebuz.pdfIn PDF document text
    • https://basundharamart.com/userfiles/file/25800885759.pdfIn PDF document text
    • http://appartementslisa.it/an3_Uploads/file/78365582820.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/87482772149.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/56180162356.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=android+tv+and+smart+tv+which+is+betterPDF 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_off0000c171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC171 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD983 16432 bytes
SHA-256: 929686b50eb850c56cc38bb0a08054ab0afddca710c76ef23e9184677b6c68f1
font_02_sfnt_off0001039b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039B 10864 bytes
SHA-256: f00db292479644f2af07b3ce073525cbb171b544cf575ab62df60215501f56ba