Malicious PDF — malware analysis report

Static analysis result for SHA-256 134bdb647d487842…

MALICIOUS

PDF

72.3 KB Created: 2020-12-18 00:15:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 9e3da0e68f8faa4e2e0c4cbdb73889df SHA-1: 9e135cdfdef7092e9eaa7010db080f4beffba993 SHA-256: 134bdb647d4878421299f35e9dd724d89b248d7406997b9cc4c3e2b78414c59e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a malicious intent to manipulate search engine results or redirect users to potentially harmful content. The ClamAV detection and ML classifier strongly indicate maliciousness, classifying it as a phishing trojan. While no scripts were directly extracted, the presence of numerous external URLs points towards a phishing or content-farming attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafficel.ru/strik?utm_term=hard+drive+caddy+best+buy PDF link annotation
    • https://nekamijej.weebly.com/uploads/1/3/4/6/134633096/regurevagaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370077/normal_5fd7d3b95047c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371523/normal_5f8b24845899a.pdfIn PDF document text
    • https://remezimivof.weebly.com/uploads/1/3/4/5/134582621/lopozoroviworef.pdfIn PDF document text
    • https://gazetitorujij.weebly.com/uploads/1/3/4/5/134599815/2687808.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/ladojenefe/wiimote_controller_apk_pure.pdfIn PDF document text
    • https://s3.amazonaws.com/nonabafat/mapixigixen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3886826e-b9b2-4b9f-acb0-268e483517e4/10472364025.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df49f57a-7b11-43d5-a708-21927a7067e6/world_atlantic_airlines_safety_record.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/803ca077-a027-44cf-90c6-d9a6e8f9d28e/3341299228.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddfa48e4-e80e-43f6-a01c-b710200b07ee/simple_backgammon_rules_printable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba73309e-8acc-4cc6-8f83-4e19e1e8acdb/rowuwebule.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_off0000d108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD108 4828 bytes
SHA-256: 86734001cdfd4d68ee702819836bccab4b9cf69bb0946d37a3249394529c890a
font_01_sfnt_off0000e18a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18A 10828 bytes
SHA-256: 1599d827e3e08e52eef8b2ceabcab7ad9f338806c21992dec3d10def18c59186
font_02_sfnt_off00010682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10682 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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