Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fa31a69965b9b9e…

MALICIOUS

PDF

74.9 KB Created: 2021-02-22 19:00:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 33b954ca91b1e1d5b109ff4dbfb74cbc SHA-1: 1b2fae898a18e174a051de22410b8f6459ef00eb SHA-256: 8fa31a69965b9b9e4c4d27b9e12b66b58fb08865c6d14d33c5e700b176d72e72
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links pointing to suspicious domains, with one heuristic specifically identifying a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, but the presence of numerous links suggests a lure to external, potentially harmful, resources.

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 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://yafferge.ru/wix?keyword=worksheet+%25235+double+replacement+reactions+answers In PDF document text
    • https://pozuzedik.weebly.com/uploads/1/3/4/6/134668333/fadowomikarejeze.pdfIn PDF document text
    • http://gelchlen.fun/11275122222o5o1p.pdfIn PDF document text
    • http://vinnipoh.fun/vepekadajabel2zdoh.pdfIn PDF document text
    • http://9gusevshop.website/emulator_android_for_pc_paling_ringani85re.pdfIn PDF document text
    • http://ninureluxoxanu.22web.org/86624403356.pdfIn PDF document text
    • https://vokavubibobudew.weebly.com/uploads/1/3/5/3/135316357/kawenez.pdfIn PDF document text
    • https://bufasijo.weebly.com/uploads/1/3/2/7/132740378/xogulofonavibinutof.pdfIn PDF document text
    • https://nutakiderovex.weebly.com/uploads/1/3/4/6/134622867/7067810.pdfIn PDF document text
    • http://sberbank.services/kaynama_noktasC4B1na_etki_eden_faktC3B6rlerqo489.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/zalomi/jazogerinatazuvulodo.pdfIn PDF document text
    • http://sonasekofuxix.rf.gd/bokanopejofifexozasura.pdfIn PDF document text
    • http://sekovukubetib.epizy.com/bitcoin_wallet_apk_latest.pdfIn PDF document text
    • https://s3.amazonaws.com/zumezeviwakiz/french_restaurant_menu_template.pdfIn PDF document text
    • https://s3.amazonaws.com/tometubufimopim/glencoe_health_chapter_24_answers.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF76 4236 bytes
SHA-256: b17f9b6c0f7131668e5b81519f467f058419569c1e71750dd5aafc9d7d05719f
font_01_sfnt_off0000ede7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE7 10224 bytes
SHA-256: 44c55b946edd4f0e8fd24a6db84aaa631a51c35e8debf89a47f615578f5549df
font_02_sfnt_off000110e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E3 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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