Malicious PDF — malware analysis report

Static analysis result for SHA-256 e06c475b57e37c32…

MALICIOUS

PDF

70.4 KB Created: 2021-02-22 08:45:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: aa8ac44cdf999cd0ac9130ac910a01ef SHA-1: 9ce715f1c59a2019aafbc727786b7cfd21560b94 SHA-256: e06c475b57e37c32d4c0e8c29f3d7a91b084d9bcd082a476b026e17e143e8884
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting services, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded links and the heuristic firings point towards a phishing or redirection attack.

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=ado.net+c%2523+mysql+tutorial In PDF document text
    • https://cdn.sqhk.co/votijavos/fbijrhh/shareit_app_free_download_uptodown.pdfIn PDF document text
    • https://juwomazitebuden.weebly.com/uploads/1/3/1/4/131414743/zepaxiwafile_sateke_bolojodonapar.pdfIn PDF document text
    • https://genofegewad.weebly.com/uploads/1/3/0/7/130776157/tobozobum_pepokuxifav_wakozowuboniri_jijiwiwu.pdfIn PDF document text
    • https://jinobodusere.weebly.com/uploads/1/3/4/7/134722577/3783397.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368479/normal_601cf9c7043be.pdfIn PDF document text
    • http://prizinsta365.online/3ds_error_code_003_1099v6x8d.pdfIn PDF document text
    • https://cdn.sqhk.co/wokinuge/kijmgfs/vinota_cheap_international_calling_app.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494875/normal_602d47d2e992d.pdfIn PDF document text
    • https://cdn.sqhk.co/wamamuli/hjhejiV/figid.pdfIn PDF document text
    • http://meine-gebuhrenfrei.com/tazinifiwofokamuropimemuw5ugw.pdfIn PDF document text
    • https://kilutiwoxit.weebly.com/uploads/1/3/1/6/131636983/c6334f.pdfIn PDF document text
    • https://cdn.sqhk.co/fixosotefe/aaiaBgO/24923326981.pdfIn PDF document text
    • https://finudekenituw.weebly.com/uploads/1/3/6/0/136053274/fozamiz.pdfIn PDF document text
    • https://cdn.sqhk.co/rekosiseweno/vhaYici/21248073295.pdfIn PDF document text
    • https://cdn.sqhk.co/rolileduvof/Jgi2kha/fuvaru.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://keberugut.epizy.com/medicare_levy_exemption_application_form.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_off0000d8da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DA 4436 bytes
SHA-256: 3c81c9ef1b3ad7660f144bf39c1df8bd291853fd0602252829e593b8018a28da
font_01_sfnt_off0000e80b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80B 11012 bytes
SHA-256: ed5d4ade466c3910c35aa854657eee8d7235ce5f0c247c5116de71549c07f60c

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