Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f4c8d1923fd412a…

MALICIOUS

PDF

35.8 KB Created: 2020-10-06 21:42:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7734a5e96bb2b66b3a6b39f9b4e261df SHA-1: 98e2ab50bc54261bf3cce6e55d67b46d7fda64e5 SHA-256: 5f4c8d1923fd412ae3a37758635fcb58cddadf120159b53fb1ea23d9a92ccade
124 Risk Score

Malware Insights

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

The PDF file contains a link disguised as a housing payment application form, which is a common lure for phishing attacks. The link points to known malicious redirector infrastructure, indicating an attempt to lead the user to a harmful site. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than 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.
  • 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://gettraff.ru/strik?keyword=www.nihe.gov.uk%252Fdiscretionary+housing+payment+application+form.pdf In PDF document text
    • https://site-1039800.mozfiles.com/files/1039800/nonum.pdfIn PDF document text
    • https://site-1041672.mozfiles.com/files/1041672/66434403642.pdfIn PDF document text
    • http://files.maxreads.co.uk/uploads/1/3/0/9/130968934/8390517.pdfIn PDF document text
    • http://nawekame.northwesterncoffeemills.com/uploads/1/3/2/8/132814241/sadirefadup.pdfIn PDF document text
    • http://files.communityfencing.org.uk/uploads/1/3/1/4/131438143/tunolegaxuxirer_wobotomilotom_widuriw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f0ca12a-b0f8-4a54-a53d-99c6295d4628/gajikugev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04fee907-33c0-4f05-9781-a2fc57ffd430/29656740163.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55362da0-daa6-4165-87a1-ac882cb53b74/fopudezanegaxabi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2733244-6ecf-40ba-9e2d-5660eb962fd3/48187198970.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56f5348d-9fc0-4112-9e6a-1519433d1640/63492293476.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/4944/6307/files/goodys_department_store_macclenny_fl.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/5708/1251/files/vevudofiwafe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/0420/1640/files/72310794721.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_off00004b3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4B3F 5968 bytes
SHA-256: 19cf4ad3e3cd97783f6798318de3d8d69ae9f85a51c439b14f4bb71cc50dbd97
font_01_sfnt_off00005fa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FA3 9904 bytes
SHA-256: 86911ecc48db3ab52521d30859cb12ae5201f72063ed04cd56a5fedde3aa7644

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