Malicious PDF — malware analysis report

Static analysis result for SHA-256 26ae72d4722b4fff…

MALICIOUS

PDF

99.1 KB Created: 2021-03-23 02:40:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f9064b4d7aca7c454de86b902eb2a5eb SHA-1: b4ceace579d5c746ea3e90882c76bfe046a0a88a SHA-256: 26ae72d4722b4fff27f9f040e9f1e5a79b5de61bff5f4d601c93e7e0446a8f3c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting it's part of a link farm designed to drive traffic to potentially malicious sites. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'graphing inequalities', which appear to be lures to disguise the true purpose of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://xajibur.ru/123?utm_term=graphing+inequalities+on+a+number+line+pdf PDF link annotation
    • https://guwemegarorara.weebly.com/uploads/1/3/4/3/134353603/8234240.pdfIn PDF document text
    • https://dobeluxujopi.weebly.com/uploads/1/3/0/7/130775615/gurad.pdfIn PDF document text
    • http://getdouche.xyz/how_to_use_maschine_studio_with_abletonnsee3.pdfIn PDF document text
    • https://zupabigawobal.weebly.com/uploads/1/3/4/3/134326688/8d4962f81.pdfIn PDF document text
    • https://rotarivinevi.weebly.com/uploads/1/3/4/5/134599250/fetemijuvun.pdfIn PDF document text
    • http://ryursew.space/mupafabazikimerizu4jaur.pdfIn PDF document text
    • https://xezagepu.weebly.com/uploads/1/3/4/9/134901129/tesosuterazi.pdfIn PDF document text
    • http://importants.space/secured_promissory_note_template_californiac36vh.pdfIn PDF document text
    • http://meine-gebuhrenfrei.com/p_touch_label_maker_softwareknf1k.pdfIn PDF document text
    • http://letgtma.bid/xotamevifixukeguwitastvfkd.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/vipinib/66591143115.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da77629b-68f5-4b4f-94ff-6633a1d6d7b5/what_is_emotional_labour.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fe6d168-b4ba-4fe4-b797-8c2e4cf5fdd5/what_is_cloud_service_model.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ad3698a-06ca-4ed2-acff-0c9a945f0db3/64686051609.pdfIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/nefiburazevupafedi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1b3cd59-60b5-4a75-baa7-afb60ca82674/how_long_count_to_a_million.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/603fb9e7-c6c9-456c-90e0-05d57829231d/mechanical_engineering_formulas_pocket_guide_mcgraw-hill_pocket_reference.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49170bf3-d10e-43af-873e-0154d24819fc/spanish_verb_conjugation_practice.pdfIn PDF document text
    • https://a84030a7-2e48-4039-807a-383e2b7216cc.filesusr.com/ugd/c5d40f_3cd3162e1f9c49408f542d2ee89d789f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/beabae6a-6a1b-45ad-8ca4-0df12db84a94/10310220452.pdfIn PDF document text
    • https://s3.amazonaws.com/ladojenefe/wogusorek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff40ebf2-b6c3-48f4-af33-1fac308fc290/what_do_the_myer_briggs_letters_mean.pdfIn PDF document text
    • https://s3.amazonaws.com/xalexojaxipud/papudumiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67ae11f7-a95f-46ee-9a6f-aa1cb6ed45ec/como_hacer_una_ficha_bibliografica_para_un_libro.pdfIn PDF document text
    • https://3682d434-6e27-4ac8-9ac2-d3ec24fa429c.filesusr.com/ugd/9b5f63_240d7f34c59a4f8cafe33da02c7a8416.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e60a0c4d-0315-4e0f-b215-de64cfcb33f2/6955631324.pdfIn PDF document text
    • https://s3.amazonaws.com/punurum/widawomanifi.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_off0001449d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1449D 5752 bytes
SHA-256: ffa2974687459aab9785506a63eb928b9adbe7bfe3f2625c8ddacc8fdce4457b
font_01_sfnt_off000157f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157F6 11080 bytes
SHA-256: bd75846068b509962bd61390d355059f86ac3aff64c07400e8f93eba20e3de90

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