Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbaa875d8320a09d…

MALICIOUS

PDF

47.3 KB Created: 2020-10-08 10:52:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: d9cd699e1236be6d6ea201b7c9e350d0 SHA-1: 2c75d80627a52c2b6c7c848faefc9fd8556b1c66 SHA-256: fbaa875d8320a09d92823673b7a74d345f888a75709db76f2102faa53d2073dc
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable domains or known malicious redirectors, indicating a link farm for phishing or malware distribution. The document body, though partially corrupted, contains text related to 'Kalendarz 2019 pdf druk' and a URL that appears to be a malicious redirector. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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 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.
  • 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://cctraff.ru/strik?keyword=kalendarz+2019+pdf+druk In PDF document text
    • http://vojimuti.coreenergycleansing.com/uploads/1/3/1/8/131856725/xezenajozuk.pdfIn PDF document text
    • http://files.jrlederle.com/uploads/1/3/1/4/131454207/lexised.pdfIn PDF document text
    • http://files.providencerescuemission.org/uploads/1/3/2/3/132303010/widabumowo-suzeginoxekabim-zubepusubeba-ripegufas.pdfIn PDF document text
    • http://files.bevingroup.com/uploads/1/3/0/8/130874530/kazegajemiropod_reribusegiji_wipifikawirave_palukozolizo.pdfIn PDF document text
    • http://kimapaxup.bbt-livonia.com/uploads/1/3/2/3/132303354/18d0dca34.pdfIn PDF document text
    • http://files.portfolio-people.com/uploads/1/3/1/4/131406222/4975795.pdfIn PDF document text
    • http://files.suzytbophotography.com/uploads/1/3/1/4/131438786/mulotasu-depatarij.pdfIn PDF document text
    • https://site-1036783.mozfiles.com/files/1036783/mojutef.pdfIn PDF document text
    • https://site-1036699.mozfiles.com/files/1036699/69877407258.pdfIn PDF document text
    • https://site-1039720.mozfiles.com/files/1039720/46248228593.pdfIn PDF document text
    • https://site-1040174.mozfiles.com/files/1040174/89322735.pdfIn PDF document text
    • https://site-1039431.mozfiles.com/files/1039431/vazugadubajalit.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/1839/8107/files/fedex.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4434/6792/files/69844232443.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4380/5594/files/lufuvumuserub.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
    • 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_off0000655d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x655D 5424 bytes
SHA-256: 19eb12dca8cf15a3b1a8161c468616ccd80effce893837376686590cf6274740
font_01_sfnt_off000077e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77E5 10172 bytes
SHA-256: 614e444738a2090b676255cc2ecb3fa794862370dfe8a265dac9451fa5eb7120
font_02_sfnt_off00009a8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A8B 16312 bytes
SHA-256: 975089639afea594160f6daa1ae948ffc4125994d61a9fd32dce02580f7b6b15

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