Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b8f20eba9865704…

MALICIOUS

PDF

78.3 KB Created: 2021-02-28 15:18:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 9a70482a02adc009f90567779c80685e SHA-1: 721cfb20d54f238943990d3989a46c3064bf2808 SHA-256: 0b8f20eba98657041e8e41fbfb538d979222aec05a426832bd1c32b836b8e9d1
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to disposable domains, which is characteristic of SEO manipulation or phishing campaigns. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. The embedded URLs and the PDF structure suggest an attempt to lure users to malicious content or exploit vulnerabilities.

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://golowaki.ru/wb?keyword=sole%20e95%20for%20sale%20near%20me PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4462732/normal_5ffbca62cfe6d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457848/normal_6031bdd16c212.pdfIn PDF document text
    • http://gisoboxizaza.mygamesonline.org/evh_5150_iii_lbx_ii_settings.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446380/normal_5fd3d749aca54.pdfIn PDF document text
    • http://lapitubemexidi.mywebcommunity.org/ladidifadifadipi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481163/normal_601f3041ecc4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379854/normal_5fdb765d275f1.pdfIn PDF document text
    • http://viniveba.mywebcommunity.org/99104680254.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448558/normal_603b4b90a93f7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366659/normal_6005038a4ca10.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460709/normal_5fca7575f05eb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416927/normal_5fed5c084176b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427514/normal_6012bea475dcf.pdfIn PDF document text
    • https://pesasujax.weebly.com/uploads/1/3/4/8/134882000/pilukemarimurut.pdfIn PDF document text
    • https://bemozepe.weebly.com/uploads/1/3/0/7/130739793/visipamaworew_jabubewibapugim_gidiraveridoz_vudenutafef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366362/normal_6039035c40ef3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lumosaneja.onlinewebshop.net/les_miserables_film_2019_synopsis.pdfIn PDF document text
    • https://s3.amazonaws.com/bizamesuwepe/21610821410.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/metformin_toxicity_litfl.pdfIn PDF document text
    • http://jabejanaboz.atwebpages.com/18803538741.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_off0000f212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF212 5296 bytes
SHA-256: c16a09f4b4783c3a162e2bd5fcc6805961d2c92e8d2962894c86a9eb4e90dd16
font_01_sfnt_off00010402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10402 11128 bytes
SHA-256: 0b67b6a0b564e83de68eb18faff2021da0d00819d6d904511b5cf9b44ceab4c0

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