Malicious PDF — malware analysis report

Static analysis result for SHA-256 44e2856295178d3f…

MALICIOUS

PDF

73.0 KB Created: 2021-02-23 13:40:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: da5b4bde7be37b08773572c212acfbca SHA-1: dda538f2976038b7113fabc607c905dd83ab65a7 SHA-256: 44e2856295178d3f4ee146d9de8b245699549cde046f8b166a6edd57a37e6a68
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a link to a known malicious redirector, indicating a phishing or malware distribution attempt. The embedded content, though heavily obfuscated, suggests an attempt to trick the user into clicking the malicious link. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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/strik?utm_term=graco+click+connect+35+cleaning+instructions In PDF document text
    • https://cdn.sqhk.co/josozudibud/bii3jiH/digestive_tract_anatomy_picture.pdfIn PDF document text
    • https://roxomikanu.weebly.com/uploads/1/3/0/8/130873860/8198830.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451736/normal_5ffa88bcd9d11.pdfIn PDF document text
    • https://tosisevutozu.weebly.com/uploads/1/3/4/3/134328017/vofimetobavawa.pdfIn PDF document text
    • https://jileninaniwepuz.weebly.com/uploads/1/3/4/7/134771173/nagerivomidulusudoxe.pdfIn PDF document text
    • https://momimuraw.weebly.com/uploads/1/3/1/3/131384495/7c08d02f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419001/normal_601b11c106d7a.pdfIn PDF document text
    • https://molawaxurot.weebly.com/uploads/1/3/4/6/134699933/gamafe-bavofetizife-wezujomesip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369304/normal_60186d9766590.pdfIn PDF document text
    • https://bolifalaloken.weebly.com/uploads/1/3/1/4/131438202/ff120.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448110/normal_5fcb36d17195d.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/vuxalirudidel/nidusovati.pdfIn PDF document text
    • https://s3.amazonaws.com/tudawufed/botim_for_windows_7_free.pdfIn PDF document text
    • https://s3.amazonaws.com/patotale/ronutikaxikodizefuxul.pdfIn PDF document text
    • https://s3.amazonaws.com/satulibaren/jedi_hungry_jacks.pdfIn PDF document text
    • https://s3.amazonaws.com/midizaxopazeji/socket_head_cap_screw_size_chart.pdfIn PDF document text
    • https://s3.amazonaws.com/megulu/emt_final_exam_study_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/apple_music_limit.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_off0000e23b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23B 5348 bytes
SHA-256: 156ba240a3ba219955439abf894a877416e0efaeb4f2411a1e61988f4488e3f8
font_01_sfnt_off0000f47d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47D 9992 bytes
SHA-256: f22dee38c9713fd31889db4840ba1dce078851215d28c1e3bd78585379b25416

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