Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2483208dca7eedb…

MALICIOUS

PDF

73.0 KB Created: 2021-02-16 00:46:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 74600d7840abf23751af60fef55779b4 SHA-1: 103c35797203cd7d3bf481374c07f9bdb67a0a9b SHA-256: b2483208dca7eedb04c0cc57ea9d8d4b7bbfc95ae650b94835197d8c3e22fef2
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to known malicious redirectors or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO poisoning to drive traffic to malicious sites. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

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/123?utm_term=how+to+deal+with+discipline+problems+in+the+classroom+pdf In PDF document text
    • https://cdn.sqhk.co/boxumiza/0DthcyO/cricket_tournament_registration_form_2019.pdfIn PDF document text
    • https://wefizaxire.weebly.com/uploads/1/3/0/9/130969527/15bb63f.pdfIn PDF document text
    • https://cdn.sqhk.co/mogizilo/gcRjjuj/amazon_addon_chrome.pdfIn PDF document text
    • http://excschool.ru/california_dreaming_flute_solo7nduy.pdfIn PDF document text
    • http://hookup154.fun/dafonasorufawadsyx6a.pdfIn PDF document text
    • https://cdn.sqhk.co/vemoderama/bmoigsR/car_mechanic_simulator_update_2020_xbox_one.pdfIn PDF document text
    • https://cdn.sqhk.co/wukorovev/8ibmhfv/viliselajugogol.pdfIn PDF document text
    • https://pekixutub.weebly.com/uploads/1/3/1/4/131453658/kobesijofarezo.pdfIn PDF document text
    • https://cdn.sqhk.co/budajawisore/fNgdjbY/xirexukurotigisovorutos.pdfIn PDF document text
    • https://cdn.sqhk.co/kinemefuwa/yjgjdSA/mifegowigevof.pdfIn PDF document text
    • https://rixutabenenik.weebly.com/uploads/1/3/4/4/134498467/dc9f7a8dec.pdfIn PDF document text
    • https://cdn.sqhk.co/mowasikuso/9jdjeQl/wamukofivokorif.pdfIn PDF document text
    • https://tatabano.weebly.com/uploads/1/3/4/8/134850833/bofakiniridi_jebubom_fulizob_teburinuk.pdfIn PDF document text
    • https://cdn.sqhk.co/difakezil/jrkyijP/30656296782.pdfIn PDF document text
    • https://cdn.sqhk.co/perikowep/gdi5SRI/grimvalor_mod_apk_happymod.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
    • http://donenufalu.rf.gd/89509582742.pdfIn PDF document text
    • http://lufadavebu.epizy.com/equations_variables_on_both_sides_worksheet.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_off0000d2e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E5 5376 bytes
SHA-256: 8a2d1bd8a2d12c705239580c045e48ed35f0d8f41699c5647a196616bba037e6
font_01_sfnt_off0000e501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE501 10360 bytes
SHA-256: 69e048cbdd75b1023c5662a50c0f63e9730d99e2bae7ba78b75da210490c68d6
font_02_sfnt_off00010876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10876 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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