Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd6f81149fc49e65…

MALICIOUS

PDF

84.1 KB Created: 2021-01-22 17:53:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: b6551f901148dc5c0d169c6c9c1e3ee0 SHA-1: 04ad6edf7b2d07187c1bc224127f081c4fbd385f SHA-256: dd6f81149fc49e6504082bf48de8ac8492667098c13cbfb2744be694dd7dee0c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are suspicious or lead to benign but potentially unrelated content, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. The embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' point towards an attempt to drive traffic to external sites, likely for malicious purposes such as phishing or malware distribution.

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://traffnew.ru/123?utm_term=rivals+of+ixalan+draft+tier PDF link annotation
    • https://tibefuwejar.weebly.com/uploads/1/3/4/3/134332688/62c86d6ad45391.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374021/normal_5ff60a15d7029.pdfIn PDF document text
    • http://selolaz.66ghz.com/mofiludadutotuneximefudo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494668/normal_5fd7f1f12da0f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527747/normal_600a1179d57c9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bolovopizonuki/arduino_micro_datasheet.pdfIn PDF document text
    • https://s3.amazonaws.com/jixeremipet/assoluto_racing_mod_apk_2018.pdfIn PDF document text
    • http://vabuperupijod.epizy.com/bixivogogesexu.pdfIn PDF document text
    • https://s3.amazonaws.com/wovugi/varegasolirejumifi.pdfIn PDF document text
    • https://s3.amazonaws.com/zonebon/66155551053.pdfIn PDF document text
    • https://s3.amazonaws.com/vukusa/indian_audio_songs_free_2000.pdfIn PDF document text
    • http://vimitafukufes.rf.gd/25200624195.pdfIn PDF document text
    • https://s3.amazonaws.com/sisaxu/17552774524.pdfIn PDF document text
    • https://s3.amazonaws.com/lawakux/zuvixivenigedufin.pdfIn PDF document text
    • https://s3.amazonaws.com/nelizenejakarug/descargar_football_manager_touch_2018_android.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_off00010f09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F09 5036 bytes
SHA-256: 7eacc01ab3e21d09cf6c3b4287465b3b0cded1afcf3292c993e7133d85b6a26c
font_01_sfnt_off00012044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12044 10584 bytes
SHA-256: b16428d9e7b3c8c4c93ac67b97b4caa10d413e9f5a65c5531e38e1301e64a9d6

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