Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3070a56cc1ad669…

MALICIOUS

PDF

70.4 KB Created: 2021-02-19 05:29:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 5e1f662ee3333ed589ccd684fdf8ed21 SHA-1: 725f1ad77b33e4c6a23bd91944e043f0d97ecd59 SHA-256: f3070a56cc1ad669ef00b3e857b66ab25aaac51382706f5000c4c351da9d69d5
234 Risk Score

Malware Insights

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

The PDF contains multiple embedded links pointing to known malicious redirectors and a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the presence of embedded URLs and the PDF structure itself are indicative of malicious activity, likely related to spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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=wood+shop+safety+test In PDF document text
    • https://nelejezubifub.weebly.com/uploads/1/3/1/4/131406077/56f9914c7a02.pdfIn PDF document text
    • http://femuvapazurom.iblogger.org/47134030278.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473432/normal_5fee8d168e03f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416919/normal_5fccb132a8a0d.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/suxiweke/buss_it_down_video.pdfIn PDF document text
    • http://bedekopezedegej.rf.gd/barimuvipexolunusiti.pdfIn PDF document text
    • http://tabumuxiwuno.rf.gd/64053724657.pdfIn PDF document text
    • https://s3.amazonaws.com/pizivurapab/9648122482.pdfIn PDF document text
    • http://gadabejevetel.epizy.com/25119577386.pdfIn PDF document text
    • https://s3.amazonaws.com/liwara/new_morning_alarm_ringtone.pdfIn PDF document text
    • https://s3.amazonaws.com/sikuva/after_effects_news_template_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/zafaronivaj/communications_strategy_template_charity.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_off0000d7a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A8 5116 bytes
SHA-256: e177c6affce3a1392acf9de42f04e724a0cecd2aea23c975d3aa527a0e3e89d9
font_01_sfnt_off0000e92b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92B 10668 bytes
SHA-256: a10312492ad035494b81850e1bc57a5da0b0c4525e39b91c4575a64bd10a947b

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