Malicious PDF — malware analysis report

Static analysis result for SHA-256 83aec6fafcac7ba6…

MALICIOUS

PDF

74.2 KB Created: 2021-01-06 02:21:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: c54251b02c6a933289d7f011c6117cdf SHA-1: d1bde8dc08c227ba4a79cced0eed8aa9d845d6f3 SHA-256: 83aec6fafcac7ba6417aa2cc098a9752f2f9d5c7d451fb3ecfe2b1ba8322a693
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically pointing to known malicious redirector infrastructure. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to create a link farm for malicious purposes. The ML classifier and ClamAV detection further support the malicious nature of this file, likely used as a phishing lure or to distribute further malware.

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://gettraff.ru/aws?utm_term=asean+flag+guidelines In PDF document text
    • https://vamekatowozi.weebly.com/uploads/1/3/0/8/130814347/lakejegonale.pdfIn PDF document text
    • https://gotagifegu.weebly.com/uploads/1/3/1/6/131607164/6070940.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/woxewiwupir/mejufakerewapidetitoro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ec89caf-cf64-4dd9-95c5-32f453909a7c/10282393316.pdfIn PDF document text
    • https://s3.amazonaws.com/jukoxisojow/l_anatomie_du_cerveau_humain.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e2ad577-979f-45e0-8bd6-86de488a6b16/popajisafagolezo.pdfIn PDF document text
    • https://s3.amazonaws.com/gifojuxaxeva/pequannock_google_traffic_ticket.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c9fd23b-773a-48ea-8c1a-ae774d7b1f1d/5989175583.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca474e6f-201e-4e47-be37-7cd979e9b86a/93651583159.pdfIn PDF document text
    • https://s3.amazonaws.com/xarojapi/10494733589.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f89e0599-d65a-4b3a-84e7-2dcdaad90eb2/starz_movies_april_2020.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_off0000d7e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E6 4660 bytes
SHA-256: f80a2d5bb7e426ed7c04a5b77e2df45d3bebba25a30c78f591dc2ba99f681e5b
font_01_sfnt_off0000e7bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BF 11328 bytes
SHA-256: 5b8e1c7dd89064cb91c2bd0b17f9c8e9ee216a2d1129904e1564421bbb5fd8cb
font_02_sfnt_off00010e90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E90 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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