Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b310db67b785b08…

MALICIOUS

PDF

79.1 KB Created: 2021-01-06 04:17:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 855d77d8214be3420162f4558a1770f6 SHA-1: 6249544a4cc1db6767293520a99cb400b590ea03 SHA-256: 7b310db67b785b08c14d47cc3b831228aea79b891754dac36cd6f1e27ce849f8
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, indicative of a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as Pdf.Phishing.Trojan. The embedded URLs and the heuristic findings point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffnew.ru/aws?utm_term=ganpati+banner+background+hd PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4497369/normal_5ff4a26a6a42f.pdfIn PDF document text
    • https://fimegelepa.weebly.com/uploads/1/3/3/9/133999933/4101535.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375515/normal_5fd053bba50fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369328/normal_5f945de2541de.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370791/normal_5fce2c5858124.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484380/normal_5fc4832a76107.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfcbbbac-d36a-45ad-bb0a-d07e5ed4b98d/59063591411.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d103fbe0-385f-4a03-ab78-d189af138e12/soxizelevirakunokawoleduz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/479ddc2b-4b97-4c9e-915c-91df4c5c1ea8/mizige.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/272736be-ae0a-4395-afc8-4775758ed1ee/28476207483.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46e2e756-9436-4457-a604-4fe42c3eb515/jaworimot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f460743-75d1-483e-b6e6-8e4644bdda77/mini_basketball_hoop_meijer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa8f14bd-f34c-466f-8543-ca449f8f0310/sexually_transmitted_diseases_infections_kandy_sri_lanka.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_off0000da52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA52 5360 bytes
SHA-256: 6b276b64ad7390e27e19b664a8ada8bfe9797f474c06c5c7195db36587d6b523
font_01_sfnt_off0000ec87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC87 9868 bytes
SHA-256: dce3994f325438a17529f3f96a0e3091fcbac1ee6df1f035420b3f8ea37b1383
font_02_sfnt_off00010e97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E97 16060 bytes
SHA-256: eb67323a3edc51f073cf7ae7c668a4400309481d93a41d1ca3bfc03d889966df
font_03_sfnt_off0001236d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1236D 2820 bytes
SHA-256: a3b58c735aff8b3ec0a13b7e379c0e97dd4bfa60d42502acbdaf60c3089fd7d6

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