Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e273706c38fc075…

MALICIOUS

PDF

70.9 KB Created: 2020-11-14 00:16:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 63fcb3acc9dbe52685f58d5edb9c7ac5 SHA-1: 106c7bfe8fab2e593f995826937e400b4d19ebd9 SHA-256: 4e273706c38fc075fccc55655d1bbe4035ade33c85750277a14580950d04a128
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to other PDFs, suggesting a link farm or SEO poisoning attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious sites.

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
  • 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.
  • 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://trafficel.ru/aws?utm_term=indian+wedding+invitation+after+effects+template+free PDF link annotation
    • https://kibodowusi.weebly.com/uploads/1/3/4/5/134588916/78d6fece.pdfIn PDF document text
    • https://samoxaposem.weebly.com/uploads/1/3/4/3/134361226/8950295.pdfIn PDF document text
    • https://mulodunewumil.weebly.com/uploads/1/3/4/3/134314444/tolujedowibata_kakafiwujuv_sazizubag.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/tobojelusiwi/21285635678.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f511aa1-89dc-44e0-a88a-c773cd0e904b/lutheranism_vs_catholicism_chart.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/56960983394.pdfIn PDF document text
    • https://s3.amazonaws.com/bevarolimesale/28472469973.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c171fcc7-5145-486a-8127-e923036c1524/bosch_nexxt_300_series_washer_troubleshooting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82cd266a-e802-4635-90be-10b79f188cf5/bosokizukiwulejoj.pdfIn PDF document text
    • https://s3.amazonaws.com/defipedibe/61153333176.pdfIn PDF document text
    • https://s3.amazonaws.com/xotomisen/sarusizode.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28cb4b79-8a36-4256-8809-6ceadcfca267/gafebidizenu.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_off0000d7b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B7 5564 bytes
SHA-256: e17a769d7c01f0bd48fab14d1b4d058a5040965d47f7a0a717a7a75ae0e92bbe
font_01_sfnt_off0000eab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB0 10528 bytes
SHA-256: bcb9f28021f6b4e63b11c6dc8b2ce62cc58fed782cd538ee86548e5f3fa259f7

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