Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ffbd98f90d1a544…

MALICIOUS

PDF

83.4 KB Created: 2021-05-19 15:06:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: cc2a80d995aca8ae5713fe6c138dcf3f SHA-1: 94437201077eaf9b0c2fd334c4dded3291d60246 SHA-256: 5ffbd98f90d1a544135bfa1abfe03f9c205b93eb8418e4b01eab420e14b714d1
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one pointing to a suspicious domain 'midufefew.ru'. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of numerous external links suggests an attempt to redirect users to malicious content or facilitate further infection, aligning with phishing or malware distribution tactics.

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://midufefew.ru/strik?utm_term=monster+hunter+world+hammer+bone+tree PDF link annotation
    • https://zemotoru.weebly.com/uploads/1/3/2/6/132695551/72b02302.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384468/normal_5fc78d7dd45ef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369163/normal_5ff1505d8473b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450345/normal_6037eed8dc035.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496380/normal_6040429f4000c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488116/normal_601f31a432cc4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427514/normal_6000ca7e5a114.pdfIn PDF document text
    • https://zunexoxefa.weebly.com/uploads/1/3/5/3/135340588/5794776c06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417128/normal_602c716e12ab8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427085/normal_606ea657e2271.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417519/normal_5ff974b4a96f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387060/normal_601a47404d353.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383572/normal_5fe359639291b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420230/normal_6055201667663.pdfIn PDF document text
    • https://zebaraxofalolal.weebly.com/uploads/1/3/0/8/130813897/lofekuketigo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453720/normal_603c6d40572e2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472488/normal_5fce79eaaa88b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480414/normal_6012ac0c7d626.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f59b706-44f2-4859-b51a-08af50a0a676/nomuzixudatuvuwizitogomid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24f08027-92a7-42de-a33a-873763871692/75970161027.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b2f044c-bd46-41a2-99c0-841359815bca/zekomuwi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af42d70b-a1a6-467f-8c95-761306d197f8/sonic_burger_nutrition_value.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010bd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD8 5300 bytes
SHA-256: b3d7deef50128a7b9d0d4580423b74c7390f2161e89e84f6c7d314709b5fa601
font_01_sfnt_off00011dc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC7 10028 bytes
SHA-256: 2965977ee83104648fa193f4a5241addd880484218e8256784a98c1e70404d9b

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