Malicious PDF — malware analysis report

Static analysis result for SHA-256 b864d404ff52188a…

MALICIOUS

PDF

72.6 KB Created: 2021-02-23 01:10:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 3fec7de13795f31b05cac6e8782018fe SHA-1: aaf8a99449ee43f6e747b9c89d4537eb7b484f52 SHA-256: b864d404ff52188ad947feadd7151e3ae5825a753ab61aae13c2ea314dd8eba9
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, containing numerous external URLs. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting an attempt to distribute malicious content or conduct phishing. The embedded URLs likely lead to further stages of the attack, such as credential harvesting or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://jottigo.ru/wb?keyword=line%206%20spider%20iii%2030%20settings PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4473039/normal_6006eb4dbdc0b.pdfIn PDF document text
    • https://regafuraseni.weebly.com/uploads/1/3/4/6/134663643/9495695.pdfIn PDF document text
    • https://gupapuna.weebly.com/uploads/1/3/4/7/134726568/sivize.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453528/normal_600c12ce34eaf.pdfIn PDF document text
    • http://sizoxuk.22web.org/tv_guide_listings_ottawa.pdfIn PDF document text
    • http://dupomixu.iblogger.org/visio_causal_loop_diagram_template.pdfIn PDF document text
    • https://zaluzukefajol.weebly.com/uploads/1/3/5/4/135400247/6b285843d0e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372101/normal_602a33f035197.pdfIn PDF document text
    • https://pojekemo.weebly.com/uploads/1/3/4/4/134469054/mavalusafiwaga.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381964/normal_5fdc642865ae8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fipaduwa.epizy.com/32155538689.pdfIn PDF document text
    • https://s3.amazonaws.com/feliso/23956961432.pdfIn PDF document text
    • https://s3.amazonaws.com/megelugik/sadilez.pdfIn PDF document text
    • https://s3.amazonaws.com/fosalizuzu/kilomosuzanivono.pdfIn PDF document text
    • http://pulawev.epizy.com/letter_of_resignation_template_word_2007.pdfIn PDF document text
    • http://marabawem.rf.gd/notidanolosuwera.pdfIn PDF document text
    • https://s3.amazonaws.com/gotijejaj/nutoxeregiteri.pdfIn PDF document text
    • http://zipodanej.rf.gd/4649077932.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_off0000de7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7F 5288 bytes
SHA-256: 82e928f96336293b9ab25729ae1cdc977b37095cc6da3033f9d09896b71a03fb
font_01_sfnt_off0000f08d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08D 10828 bytes
SHA-256: e57467f4487965de6112d871c3937d62ba9203e04597f33bcedaaef36cabb802

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