Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc7727a1cdce9414…

MALICIOUS

PDF

96.4 KB Created: 2021-01-30 07:54:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f7988f2e073a618adfbccf02c2980f7f SHA-1: d3e6071844fdd530735e61bcd1c7b9cd5c3eb73d SHA-256: fc7727a1cdce9414bb558c5f13f4709d0cb258c1ff2f4199c6b2268ee5e9f155
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with the primary one pointing to a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to search terms, likely to trick users into clicking the malicious links.

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
  • 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.
  • 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://ggtraff.ru/wb?keyword=1986%20world%20cup%20mexico%20vs%20germany In PDF document text
    • https://cdn-cms.f-static.net/uploads/4428052/normal_5fd13a0c07321.pdfIn PDF document text
    • https://sedapelagug.weebly.com/uploads/1/3/4/1/134109100/tekosej.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415929/normal_5fef3470a0830.pdfIn PDF document text
    • https://vakinora.weebly.com/uploads/1/3/1/8/131857586/tojupixigaw-padatefufuw-tazijutifu.pdfIn PDF document text
    • https://pofemazavuson.weebly.com/uploads/1/3/2/3/132303373/7156689.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450158/normal_5ffe239bb523c.pdfIn PDF document text
    • https://jerejadudet.weebly.com/uploads/1/3/0/7/130738914/8ca2e6f276.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gupawupigawono/90450072823.pdfIn PDF document text
    • http://bukuzagalu.rf.gd/chicago_style_citation_bibliography_format.pdfIn PDF document text
    • http://girifej.epizy.com/41058560107.pdfIn PDF document text
    • https://s3.amazonaws.com/vunizi/anti_malware_for_rooted_android.pdfIn PDF document text
    • https://s3.amazonaws.com/fukezavazuj/art_1117_bis_cc_riforma_condominio.pdfIn PDF document text
    • https://s3.amazonaws.com/makumapikeze/xejewatufinebi.pdfIn PDF document text
    • http://zuniguvip.epizy.com/ubiquiti_unifi_uap_ac_lr_software.pdfIn PDF document text
    • http://zifasodokid.epizy.com/map_of_asia_with_capitals.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_off000135a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135A6 6176 bytes
SHA-256: f92aa66361834c86072ba3bddb630398c2831f26eb3d557c30a8f64c2047c510
font_01_sfnt_off00014aa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AA7 13324 bytes
SHA-256: 8ff784bf84f3ed4dea7213671dafc744834812d4e58c60e6d8f4b6e9f1c03b56

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