Malicious PDF — malware analysis report

Static analysis result for SHA-256 5437909e2ab4b5ce…

MALICIOUS

PDF

110.4 KB Created: 2021-03-01 10:20:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e0579986e680ebec49f13f6c47aa1977 SHA-1: b3ba6fae0a768646850410ac9564a581dab8042a SHA-256: 5437909e2ab4b5ce2ba43a16d24083b5c1ebca73ea2a287e1731935fa082e779
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://ponafet.ru/aws?utm_term=yamaha+r6+2014+price PDF link annotation
    • https://xujuwoxevosu.weebly.com/uploads/1/3/4/8/134896670/xanorew.pdfIn PDF document text
    • https://wudegilunukoga.weebly.com/uploads/1/3/1/3/131379548/vowolujil.pdfIn PDF document text
    • https://namavikevak.weebly.com/uploads/1/3/2/7/132740743/bf5d26e51.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/telasebisu/40597696159.pdfIn PDF document text
    • https://s3.amazonaws.com/dabatisew/xeperaxivirujuxupagorezaz.pdfIn PDF document text
    • http://rususekobijo.myartsonline.com/introduction_to_quantum_mechanics_2nd_edition_solutions.pdfIn PDF document text
    • https://s3.amazonaws.com/polojuliragam/36605001834.pdfIn PDF document text
    • https://s3.amazonaws.com/dinisemowoge/43885540883.pdfIn PDF document text
    • https://s3.amazonaws.com/nawuvud/26212010872.pdfIn PDF document text
    • https://s3.amazonaws.com/xesigeze/theeratha_vilayattu_pillai_songs_starmusiq.pdfIn PDF document text
    • https://s3.amazonaws.com/kuxuxemu/astrology_predictions_software_tamil_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vapelurowar/last_christmas_imdb_parents_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/fejenijovekozu/62188221965.pdfIn PDF document text
    • https://s3.amazonaws.com/xiwevitox/74226307476.pdfIn PDF document text
    • http://sabiwilurase.atwebpages.com/bukotoxodopawo.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_off00014dee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DEE 4984 bytes
SHA-256: e9f3a906f2f10cc968ba3aa32b00a44ae503106a672a51d091ab9b941b81a7e0
font_01_sfnt_off00015ed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15ED3 13296 bytes
SHA-256: 8cf9d64ccb70bfde72c35657526ff6d7523e406eed32c695d217ab4f6b650d13
font_02_sfnt_off00018975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18975 16164 bytes
SHA-256: 6e3fbd491d8b71441998836ddca0d0c102716a221ea14f8143929167ad9a79b3
font_03_sfnt_off00019e8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19E8A 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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