Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b76fff25b6b657b…

MALICIOUS

PDF

78.5 KB Created: 2021-02-26 01:45:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: dc2adb4d251074f80b159540e91394ef SHA-1: a2c399026fa64facd61abb4ce545c84be19fe54d SHA-256: 0b76fff25b6b657b52d0ab1e9a3ddd7b58b24c6039cc258dbdc41c73707ef543
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file contains a large number of embedded links pointing to external PDF files hosted on disposable domains, a common tactic for SEO manipulation or distributing malicious content. The presence of a link to a known malicious redirector further supports this assessment. ClamAV and ML classifiers also flagged this file as malicious, indicating a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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/strik?utm_term=how+many+books+are+in+the+walking+dead+series In PDF document text
    • https://pibezenasa.weebly.com/uploads/1/3/1/4/131454503/pedeboba-bekibabu-kuzipu-nuxani.pdfIn PDF document text
    • http://zugapuvu.mywebcommunity.org/what_happened_in_shadow_and_bone.pdfIn PDF document text
    • https://mesopivupezuna.weebly.com/uploads/1/3/5/3/135311967/tixasijexaji-tedisiko.pdfIn PDF document text
    • https://teworovesub.weebly.com/uploads/1/3/0/7/130775402/wuwaxowifomobux.pdfIn PDF document text
    • https://cdn.sqhk.co/zisubiziwu/hjgBvR9/google_give_me_my_phone_settings.pdfIn PDF document text
    • http://kisegojunu.22web.org/besazi.pdfIn PDF document text
    • https://borirokuve.weebly.com/uploads/1/3/1/4/131437567/1910685.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401692/normal_5fdbac49ba036.pdfIn PDF document text
    • http://jezolagewe.iblogger.org/learn_portuguese_free.pdfIn PDF document text
    • http://rijewomel.scienceontheweb.net/cual_es_el_sistema_inmunolgico_del_ser_humano.pdfIn PDF document text
    • https://cdn.sqhk.co/xiwasazafu/UhgjbvJ/dubenesetatukegexowivu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495269/normal_601d2cddc96d3.pdfIn PDF document text
    • http://giwapozolaleg.mypressonline.com/pokemon_emerald_walkthrough.pdfIn PDF document text
    • https://jagunafine.weebly.com/uploads/1/3/4/3/134363358/zozapilazuv.pdfIn PDF document text
    • https://jozinuzo.weebly.com/uploads/1/3/2/7/132712000/wurabadilemi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jabodegodonirad.atwebpages.com/27846303774.pdfIn PDF document text
    • http://vedumojaje.epizy.com/npuap_pressure_ulcer_treatment_guidelines.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_off0000f54e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54E 5600 bytes
SHA-256: 70160be01967604124dd1ab1b7eeba8273e02467a9f636b0df433b84125a27af
font_01_sfnt_off0001083d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083D 10796 bytes
SHA-256: 5846cbe72f21a200d17c66982d5725d440cc54ab36e9992cbbf4846a39f6877e

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