Malicious PDF — malware analysis report

Static analysis result for SHA-256 a80669f1de4b09c0…

MALICIOUS

PDF

72.2 KB Created: 2020-12-24 18:58:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 3cbac328b20f1d01653aa47f6bd872a3 SHA-1: 2f83b5e6c59d7a1a7b6891f212a7f35f9e12e406 SHA-256: a80669f1de4b09c06b6211a939c8e48a5d195d5c34b62702425dd8f5d2643898
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying it as a malicious redirector link farm. The primary URL leads to a known malicious redirector, suggesting an attempt to direct users to malicious content. The ML classifier and ClamAV detection further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://traffmen.ru/strik?utm_term=tiger+king+halloween+costume+meme In PDF document text
    • https://static.s123-cdn-static.com/uploads/4382621/normal_5fe36b1021de7.pdfIn PDF document text
    • https://cdn.sqhk.co/lepemafe/whiiczn/79065217727.pdfIn PDF document text
    • https://cdn.sqhk.co/tuxisilogok/fbTWgjs/ppsspp_emulator_games_for_android_free_download_apk.pdfIn PDF document text
    • https://zosonokabawim.weebly.com/uploads/1/3/4/3/134316026/d2f41bc9d42131.pdfIn PDF document text
    • https://cdn.sqhk.co/letowajaf/msicjjb/mega_ramp_stunts_master_speed_boat_racing_games.pdfIn PDF document text
    • https://cdn.sqhk.co/xejulonejo/Ahcjauq/metavodiwek.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418166/normal_5fe046951365e.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/fujadabez/vumojexovebovaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f00f524a-6a2b-49be-84a3-d37ec160e9e3/niwidapovivijutudewozo.pdfIn PDF document text
    • https://s3.amazonaws.com/xuxifuzituwu/58126602647.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8a530ec-99c3-46d9-aef5-374cc876691d/vatijuzabiv.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/pokosopetasaxebofemavu.pdfIn PDF document text
    • https://s3.amazonaws.com/digigitusuduk/roblox_free_accounts_with_a_pin.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_off0000dd12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD12 5320 bytes
SHA-256: 9cea0dd00462836816c01ad52d6c10373260352f2b69b797e8f433e8b02b1273
font_01_sfnt_off0000ef15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF15 10740 bytes
SHA-256: 8607d336c61b83283a5fe2d8cffa63346c8e2c806203afd981fd622bb661b37e

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