Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e61fcc71de481c5…

MALICIOUS

PDF

83.9 KB Created: 2021-02-02 02:43:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 28553740223d660875ee10a215603fcb SHA-1: 1a3910994c87bbe694264b7538fd454430310c04 SHA-256: 8e61fcc71de481c5d8b5640d6575105f7241219fbb30d9e39f61686fd9de96de
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, forming a link farm. One critical heuristic indicates a direct link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://yafferge.ru/123?utm_term=smartcentral+remote+control+links In PDF document text
    • https://cdn-cms.f-static.net/uploads/4384644/normal_600cf1106539a.pdfIn PDF document text
    • https://nobuzuza.weebly.com/uploads/1/3/4/7/134757083/4134293.pdfIn PDF document text
    • https://kisimerib.weebly.com/uploads/1/3/4/6/134697331/pipitemu-rufib-rametosakuvi.pdfIn PDF document text
    • https://dexulivixuwe.weebly.com/uploads/1/3/0/7/130739852/tuzomufip_zefop_botix_nezurolepirara.pdfIn PDF document text
    • https://cdn.sqhk.co/kupodakojav/zngijfU/59228425123.pdfIn PDF document text
    • https://xutareziwax.weebly.com/uploads/1/3/5/3/135327408/kadiduwubuxida.pdfIn PDF document text
    • https://rebigakudaj.weebly.com/uploads/1/3/1/3/131383708/21215d3a0ac9504.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/pazatuv/85700399241.pdfIn PDF document text
    • https://s3.amazonaws.com/juwofuxufijup/42741468805.pdfIn PDF document text
    • https://s3.amazonaws.com/tigovatolis/newspaper_ad_design_templates_free.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/63441171912.pdfIn PDF document text
    • https://s3.amazonaws.com/jusagi/garnier_serum_sheet_mask_for_oily_skin.pdfIn PDF document text
    • https://s3.amazonaws.com/kuxuxemu/76872200389.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10011 4900 bytes
SHA-256: c10d0fb9c34841bd69416c00c574a07f77bbcd070d7cbebfd1e704ed5ae4bc8e
font_01_sfnt_off0001107b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107B 10588 bytes
SHA-256: b1d750038fc8e0d63e69d62f066594f5413cf47a41e213fada463a96f086a38c
font_02_sfnt_off00013485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13485 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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