Malicious PDF — malware analysis report

Static analysis result for SHA-256 73980925d7afd4f6…

MALICIOUS

PDF

72.3 KB Created: 2021-01-01 09:53:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 1ddd3169a62605f140db705183783d81 SHA-1: bb87976300f233a33b64d3b8f5860d417e2d616e SHA-256: 73980925d7afd4f66512a75dea973f52b913cbe4ef1bf77d2314cf44c3a49e3f
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a PDF URI pointing to 'trafffi.ru' with a query parameter suggesting a hack/mod download, combined with heuristics for a link farm and a download button lure, suggests a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafffi.ru/123?utm_term=apk+hack+mod+candy+crush+saga PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374374/normal_5f904d872ee43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365621/normal_5fae624fcc9b9.pdfIn PDF document text
    • https://cdn.sqhk.co/topedimerab/fhbjhYO/centurylink_email_sign_in_page.pdfIn PDF document text
    • https://fuzuvetidodevik.weebly.com/uploads/1/3/4/6/134637128/78c180a.pdfIn PDF document text
    • https://nejufolij.weebly.com/uploads/1/3/4/8/134883139/4010234.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/29129ed3-a56c-4103-8b3e-c7f06fd77cc8/92671215395.pdfIn PDF document text
    • https://s3.amazonaws.com/lebaxa/mee_mee_breast_pump_manual_review.pdfIn PDF document text
    • https://s3.amazonaws.com/rixevozajixezos/first_grade_grammar_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1a424e2-c9c4-4d6a-801f-f8eeb8cfa48f/embrace_the_darkness_2_imdb.pdfIn PDF document text
    • https://s3.amazonaws.com/fajonubinomeder/9721339325.pdfIn PDF document text
    • https://s3.amazonaws.com/tobovunoberiki/gelewugabadiwobanabor.pdfIn PDF document text
    • https://s3.amazonaws.com/remoxi/jesifusavatida.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_off0000dd13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD13 5608 bytes
SHA-256: 721653c8bbc3d14fbf5515c3a700465565fc9e77f04429eb5e1c995d64f71e7f
font_01_sfnt_off0000f00d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00D 10832 bytes
SHA-256: 7f5220f88a0510b4cd7797ef189f874bfbf2e9c977bf03eaefbe6f50e2fc97e0

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