Malicious PDF — malware analysis report

Static analysis result for SHA-256 38080c206be26945…

MALICIOUS

PDF

93.1 KB Created: 2021-02-18 05:55:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 0db7935d176bc829ab17212bdce82e35 SHA-1: 57929ac4d858b5af0b2fefc2f5d9b888c201163c SHA-256: 38080c206be26945bcac35fabeb7aee7bddd6cb4bb4f00fa8621c196215adb3a
222 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, with a critical heuristic identifying it as a malicious redirector link farm. The primary malicious URL points to 'yafferge.ru', which is likely used to redirect users to further malicious content or phishing pages. While many other URLs are present, their reputation is mixed or unknown, and the presence of a malicious redirector is sufficient to classify this as a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://yafferge.ru/123?utm_term=master+of+orion+conquer+the+stars+best+mods In PDF document text
    • https://dufadijikog.weebly.com/uploads/1/3/5/3/135325035/902602.pdfIn PDF document text
    • http://cmb-accueil.com/bahubali_2_video_songs_telugu_freep9jio.pdfIn PDF document text
    • https://rubebukani.weebly.com/uploads/1/3/0/7/130740450/solizozasunenigube.pdfIn PDF document text
    • https://buvapubadoloj.weebly.com/uploads/1/3/4/2/134265521/jejubijixefowi.pdfIn PDF document text
    • http://ellmax-site.xyz/2001_mercury_25_hp_4_stroke_specsgs98p.pdfIn PDF document text
    • https://tekoriforeta.weebly.com/uploads/1/3/4/6/134639422/5600413.pdfIn PDF document text
    • https://lemusudavigi.weebly.com/uploads/1/3/5/3/135395292/vaxatalozusefataweti.pdfIn PDF document text
    • https://kugavulaxux.weebly.com/uploads/1/3/4/4/134454690/dojodananikodivasimi.pdfIn PDF document text
    • https://togezajotutev.weebly.com/uploads/1/3/0/8/130874352/vapexusure_jijovi_jevupikoki_vanegevokazined.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wesaloxovep.rf.gd/reading_worksheets_for_6th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/tobojelusiwi/3763532696.pdfIn PDF document text
    • http://lakonupinazuj.rf.gd/mapigozemow.pdfIn PDF document text
    • http://vatasinunevuto.epizy.com/10350052507.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/insulation_foam_sheet_lowes.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwuzerijofa/how_to_update_pepper_flash_chrome_manually.pdfIn PDF document text
    • https://s3.amazonaws.com/megulu/jogigigokovufuga.pdfIn PDF document text
    • http://sikirubuguje.epizy.com/descriptive_statistics_mcq.pdfIn PDF document text
    • https://s3.amazonaws.com/nezanurugega/remove_chrome_history_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_off00012f1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F1C 5500 bytes
SHA-256: 1639fdf1a5d2a2539659a66916635255a9abea8f836d84d029878da8adc1ed20
font_01_sfnt_off000141aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141AA 10876 bytes
SHA-256: 21987d774f25654270deb2b17ef57ed2fbd9fd05acd24a358941fa2be3a24a79

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