Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb70f9170aaaf7e5…

MALICIOUS

PDF

106.6 KB Created: 2021-06-02 20:56:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 00a07ff8caa9f687cfdc233f2dffebf7 SHA-1: 043c2514c5c2382ff33cb389cbc9180287af6193 SHA-256: fb70f9170aaaf7e5d3ab5c7b9eaf4728fbc4b4049cb8f3780f1e7ae845783588
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The document body, though heavily obfuscated, contains references to 'Cisco webex hybrid call deployment guide' and 'wkhtmltopdf', indicating a lure to disguise the malicious intent. The presence of numerous external links and the ML classifier's high confidence score strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://fokemale.ru/123?utm_term=cisco+webex+hybrid+call+deployment+guide PDF link annotation
    • https://jikevumuvovidu.weebly.com/uploads/1/3/4/3/134324483/3081619.pdfIn PDF document text
    • https://wilowukodol.weebly.com/uploads/1/3/4/8/134881933/lonejake.pdfIn PDF document text
    • https://vuvudarekiw.weebly.com/uploads/1/3/4/0/134017261/7d610f5aa5c.pdfIn PDF document text
    • https://gezameluloxeg.weebly.com/uploads/1/3/5/3/135393377/46595c0.pdfIn PDF document text
    • https://zikagedatudupoz.weebly.com/uploads/1/3/4/2/134266226/e9b300a1f78507.pdfIn PDF document text
    • https://fusopozosasotex.weebly.com/uploads/1/3/4/4/134477759/4023975.pdfIn PDF document text
    • https://puxajibixitukus.weebly.com/uploads/1/3/4/4/134457664/gutumidofuf.pdfIn PDF document text
    • https://zazatunuwib.weebly.com/uploads/1/3/4/7/134729601/muvejalaner.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459329/normal_604d05e79951c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452608/normal_60122218c505f.pdfIn PDF document text
    • https://dulawatekonirul.weebly.com/uploads/1/3/4/5/134589918/maduzabamedazaf.pdfIn PDF document text
    • https://faxofisokat.weebly.com/uploads/1/3/4/5/134598269/fodebenamer-fuxam-waligokejasane.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481540/normal_5fe8cb6b2fb33.pdfIn PDF document text
    • https://xurekibovadava.weebly.com/uploads/1/3/0/9/130969225/4c292.pdfIn PDF document text
    • https://renezotutumiw.weebly.com/uploads/1/3/5/3/135343322/58d1324e0df1.pdfIn PDF document text
    • https://gonufefimexej.weebly.com/uploads/1/3/4/8/134892828/6661289.pdfIn PDF document text
    • https://sevujixosatanin.weebly.com/uploads/1/3/5/3/135316334/lanaroz.pdfIn PDF document text
    • https://letezinujafi.weebly.com/uploads/1/3/4/9/134901841/2273429.pdfIn PDF document text
    • https://ganuzuvotaju.weebly.com/uploads/1/3/5/3/135304652/eecd8.pdfIn PDF document text
    • https://fubaxuzepavuzoz.weebly.com/uploads/1/3/4/7/134755559/sidukum-vikojijod-laxafusuf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wufamazajo.pbworks.com/w/file/fetch/144445893/fakevusapesanonedidov.pdfIn PDF document text
    • http://wiwedano.pbworks.com/w/file/fetch/144425085/27899630881.pdfIn PDF document text
    • http://dobifapig.pbworks.com/f/29144263144.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16192 5792 bytes
SHA-256: 4e4244640d03b19d721f5416bbe1b4dcc8d7f9026e2d9ba6a61709e922465aeb
font_01_sfnt_off00017538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17538 11612 bytes
SHA-256: f72968732fa6c6fc90c0be83a52224bc37637fcf4283cdadd1ed967626e07e1e