Malicious PDF — malware analysis report

Static analysis result for SHA-256 a36c44520758dc93…

MALICIOUS

PDF

67.7 KB Created: 2021-01-16 15:40:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f12a09162215b6b29e892d2ef176ab23 SHA-1: 8f9d795d1db2fc25615a65bed856c618254bea47 SHA-256: a36c44520758dc93d8a19675458f8c10508df515a2572f72630fae1430db1842
214 Risk Score

Malware Insights

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

This PDF file contains numerous links to external websites, many of which are part of a link farm designed to manipulate search engine results. One critical heuristic indicates that the PDF links to known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to contain keywords related to real estate rentals, suggesting a lure to disguise the malicious intent. The presence of multiple embedded URLs and the link farm heuristic strongly suggest this document is used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://traffine.ru/wb?keyword=shelter%20island%20real%20estate%20rentals In PDF document text
    • https://cdn.sqhk.co/fofodafexadu/gjavfhh/47751547224.pdfIn PDF document text
    • https://cdn.sqhk.co/jivaduzar/hc5ggZO/25526205991.pdfIn PDF document text
    • https://vopevejefed.weebly.com/uploads/1/3/1/6/131606133/xiwigaluxoga_zovozarujixafo_lirinapujeturun_piwujixa.pdfIn PDF document text
    • https://gebiworopefibo.weebly.com/uploads/1/3/4/5/134583098/4b05f124cfe2.pdfIn PDF document text
    • https://cdn.sqhk.co/jogepirar/ggohhhg/house_flipping_spreadsheet_xls.pdfIn PDF document text
    • https://kikuvabafot.weebly.com/uploads/1/3/4/3/134332304/f22b7e6f8f451.pdfIn PDF document text
    • https://cdn.sqhk.co/tomubozes/jHZgfhf/lukurodo.pdfIn PDF document text
    • https://cdn.sqhk.co/lazodadevab/iajhzwH/lenusositewoso.pdfIn PDF document text
    • https://cdn.sqhk.co/bidelefo/EahbYd4/condado_tacos_menu_prices.pdfIn PDF document text
    • https://jefamozalubibul.weebly.com/uploads/1/3/1/4/131438275/kebutik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407749/normal_5f923d6027374.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/leguvefu/valawudosudobuliwigigiwo.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_off0000ccb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB6 5016 bytes
SHA-256: 3d9795e15855bd9ee47ba2bb7d4e3ad88f8a7a6b5742f618514846e125b9cb5f
font_01_sfnt_off0000ddb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB2 10732 bytes
SHA-256: 8eb082035ee2a04d150b3ab4265a56b2cf03652e449532507f8da95156df4585

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