Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecf609bb45972bd8…

MALICIOUS

PDF

67.6 KB Created: 2020-12-24 18:23:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 7b50b3cce8f9c0611d5c62464ab7d1e1 SHA-1: 79ed07c14a337ba0b78c23b25f251cae4d4617e6 SHA-256: ecf609bb45972bd8bdad4c6249658c35d95d437976a430fdceeb4e1032851881
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, with at least one identified as a malicious redirector. The heuristic firings indicate a deliberate attempt to create a link farm, likely to distribute malicious content or phish for information. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://traffine.ru/strik?utm_term=live+weather+radar+dayton+ohio In PDF document text
    • https://cdn.sqhk.co/lisesemafo/ifKBCVA/green_papaya_salad_recipe_without_fish_sauce.pdfIn PDF document text
    • https://zoxexalibefan.weebly.com/uploads/1/3/0/9/130969973/lutosis.pdfIn PDF document text
    • https://cdn.sqhk.co/kafekata/heY8heP/best_free_music_videos_apps.pdfIn PDF document text
    • https://cdn.sqhk.co/pupevadojas/jajjhem/cash_out_day_meaning_in_betting.pdfIn PDF document text
    • https://cdn.sqhk.co/rubekafux/biagejg/soxazaxelim.pdfIn PDF document text
    • https://cdn.sqhk.co/gotirawuz/EfFjf7Q/get_free_skins_and_pets_in_among_us.pdfIn PDF document text
    • https://munizifazu.weebly.com/uploads/1/3/4/3/134354015/mokufefo.pdfIn PDF document text
    • https://cdn.sqhk.co/dupeguwova/cjhgjje/zefakuxofixilufar.pdfIn PDF document text
    • https://cdn.sqhk.co/fakobijo/fhchbxB/79111915614.pdfIn PDF document text
    • https://pigukoziluluz.weebly.com/uploads/1/3/4/8/134896600/e027dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424328/normal_5faa4eaea06ea.pdfIn PDF document text
    • https://gipurafesab.weebly.com/uploads/1/3/1/6/131637457/lerewofabotox-xipusedibujum-bugofa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379220/normal_5fa19323742ca.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/ravuxudibure/cbse_board_2018_class_12_date_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/tutorial_audacity_bahasa_indonesia.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC134 4684 bytes
SHA-256: b027f479ff9d3cca12418e100e8940184de5b7b19a75a906e66e6ff3b2606e9b
font_01_sfnt_off0000d12c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD12C 9880 bytes
SHA-256: eee41ad0c63c1b37f0d9db204a2d54aaf2f9215f5a7c8f1d32309cf292e967b3
font_02_sfnt_off0000f2ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2ED 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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