Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ac84844705e1617…

MALICIOUS

PDF

83.7 KB Created: 2021-01-09 23:05:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: f83e0a4f457e87efb458b1adad02913b SHA-1: 9c301c165fcf081e1c323da3b198ecd0822f9874 SHA-256: 6ac84844705e1617a899cffb3ec164dd3ac2918963249eb90491ee480ea85e37
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for link farms and phishing. The heuristic PDF_SEO_LINK_FARM indicates a mass of external PDF links, suggesting an attempt to drive traffic or distribute further malicious content. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score point towards malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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=leave+attendance+format+in+excel PDF link annotation
    • https://xosulokut.weebly.com/uploads/1/3/4/4/134466674/naxesamamaki_rawuruvurekir_gebimobaba.pdfIn PDF document text
    • https://cdn.sqhk.co/kixalixu/iCkhaDB/nefumenupevasopajoze.pdfIn PDF document text
    • https://sefujokugitexas.weebly.com/uploads/1/3/1/4/131408298/4809792.pdfIn PDF document text
    • https://site-1176413.mozfiles.com/files/1176413/46601760030.pdfIn PDF document text
    • https://site-1206965.mozfiles.com/files/1206965/fifaz.pdfIn PDF document text
    • https://site-1174866.mozfiles.com/files/1174866/ultimate_preppers_list.pdfIn PDF document text
    • https://pujumisetuwu.weebly.com/uploads/1/3/4/5/134576336/6035963.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/gozilum/23912298532.pdfIn PDF document text
    • https://s3.amazonaws.com/jopomodilamego/fapaxudavevaxuxerigigubud.pdfIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/68008371344.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/limit.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF022 5056 bytes
SHA-256: c3294e93a638531174ce354f350b1a2df4dd8d75345b48972f5c57cea42c29bb
font_01_sfnt_off0001014b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014B 1596 bytes
SHA-256: e1b169004b423bca9c41485db30218ffb4745d26fc16d6afb88fd2973184e999
font_02_sfnt_off0001096b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096B 10136 bytes
SHA-256: e1aca63d048d0259753a6d29bead0c6d08b69ac00fbbc461db5bfefc6cdf946c
font_03_sfnt_off00012c5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C5B 16144 bytes
SHA-256: 764fe263e68fd20aff2bbd96e69f5a400d440299d02096befa162391f913c7cf

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