Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1f2209f284a7433…

MALICIOUS

PDF

72.2 KB Created: 2021-02-20 06:50:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: f28eb07d1672ce66120079bb96c5b01c SHA-1: bbc581ed46f8e9b8a7879403f858bbf0be5ad045 SHA-256: f1f2209f284a743307f482ef90f67d9fcc15d4d3ca9eb5b5600b8a4d4f867c7a
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, identified as a link farm, with a suspicious URL related to 'warrants' suggesting a phishing or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing further malicious content or phishing. No scripts were extracted, but the extensive link farm and known malware signatures point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/wix?keyword=randolph+county+arkansas+warrants PDF link annotation
    • https://cdn.sqhk.co/zufutetuwume/hb5idgh/celebrity_cruises_2021_hawaii.pdfIn PDF document text
    • https://polovetanofup.weebly.com/uploads/1/3/5/3/135330247/wavoz-genojezadadol-xemojesizepavi-zezumavawuw.pdfIn PDF document text
    • http://baffer-shop.space/57046496213wox7j.pdfIn PDF document text
    • https://cdn.sqhk.co/tumupowe/kcjdPMA/96761184056.pdfIn PDF document text
    • http://waystep.site/73507825937xwyly.pdfIn PDF document text
    • https://cdn.sqhk.co/dapumexader/yjcGidm/xixiduv.pdfIn PDF document text
    • https://cdn.sqhk.co/rutisifelom/hchdibg/45920097540.pdfIn PDF document text
    • http://wuzubofetaxoger.iblogger.org/73429040326.pdfIn PDF document text
    • https://zuwumepegowivos.weebly.com/uploads/1/3/1/0/131069935/96abed.pdfIn PDF document text
    • https://cdn.sqhk.co/kupovite/gdic1hd/wonip.pdfIn PDF document text
    • https://cdn.sqhk.co/loziromegon/d6xpQY7/ultimate_moto_rr_3_mod_apk.pdfIn PDF document text
    • http://garant-ritual.online/radiantly_alive_scheduleg2hbs.pdfIn PDF document text
    • https://goxatuzibifonev.weebly.com/uploads/1/3/0/7/130739188/e2533d8cf82646.pdfIn PDF document text
    • https://duxawedi.weebly.com/uploads/1/3/4/4/134477895/xidoxuzefage.pdfIn PDF document text
    • http://logoped-samara.ru/steps_in_agrobacterium_mediated_transformationzn960.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d30e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD30E 5424 bytes
SHA-256: ca46d8d3d7d718c97830d3fc957cfd39769ae0330d2e68e6ee4766f35b2d52e5
font_01_sfnt_off0000e594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE594 14904 bytes
SHA-256: 6f819a5390699a786ed9e61188af355e0102a1bda3092a049a468cf601ff9bfb

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