Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba3bae123e066996…

MALICIOUS

PDF

79.3 KB Created: 2020-11-17 11:31:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: f4f666e95c46eb4f5caf7361a473925c SHA-1: b9a75db4f9ae6e40007b9e7874d2313f04fea88f SHA-256: ba3bae123e066996922c11e66a07fdaa8c5ee575388d832c46f3d396953140d7
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. The primary URL points to a domain associated with SEO spam, and the document body, though heavily obfuscated, contains references to Excel functions. ClamAV also detected this as 'Pdf.Phishing.Trojan'. The presence of embedded links suggests an attempt to direct users to malicious or spam content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafftec.ru/aws?utm_term=excel+indirect+function+reference+another+sheet PDF link annotation
    • https://muzokive.weebly.com/uploads/1/3/4/4/134498707/zabesozunakebetoru.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404723/normal_5f9205b4b4035.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381081/normal_5f946b5332f18.pdfIn PDF document text
    • https://pipenibeteza.weebly.com/uploads/1/3/4/5/134508730/dutanamunepu-latejejevozuxe-vagonog-makiviwejokeda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370265/normal_5f8a4a616cb2f.pdfIn PDF document text
    • https://wipomozexabezi.weebly.com/uploads/1/3/0/7/130776841/6f001abef.pdfIn PDF document text
    • https://dasujodiket.weebly.com/uploads/1/3/4/4/134481559/3262112.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://uploads.strikinglycdn.com/files/4eb383df-e487-4196-b440-e9ab8829a5b0/bopuletusabarudewati.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22801a67-a965-422a-be10-62e523b0cf1e/37341350473.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f73f5f23-b05a-45d0-b392-8f43c9313ccd/makusixofubosu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce0537ae-f4fe-4406-b61e-52818df4bf61/53960079463.pdfIn PDF document text
    • https://s3.amazonaws.com/sumesawoxajew/mefovigima.pdfIn PDF document text
    • https://s3.amazonaws.com/gonavo/20848379974.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://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF33 5132 bytes
SHA-256: ac4137508950ef5fc78d0d127e7b0db3efdd470b25b0d953d6e8a025b0521a5f
font_01_sfnt_off0000f09c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09C 8676 bytes
SHA-256: bd268e58ad4a91718fd8be2bd5bdf3b0045033b831ae26d239e681cb0fe2fdc0
font_02_sfnt_off00010935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10935 11336 bytes
SHA-256: e86fcd90513fb516c5e31420dd58b25fdb875516aaf113952c9904d993adca7b

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