Malicious PDF — malware analysis report

Static analysis result for SHA-256 706446191bcffc12…

MALICIOUS

PDF

76.7 KB Created: 2021-05-30 08:49:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 5d03e3c3264f142250ec860b12b3af36 SHA-1: b33a5f6f473321d36a2bc410a97cdc2e0a3b2c77 SHA-256: 706446191bcffc12033b15d62cf7caa9cdf0b4380b994ffc9df0f1fcc7267319
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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.
  • 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://dafemum.ru/123?utm_term=nts+test+answer+key+2019 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4421215/normal_5ff5f298549a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409997/normal_601b908f1bdfb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445564/normal_6011127f17a72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462093/normal_606dcefeaa3a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389095/normal_602b4de229a37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485799/normal_6050d03a87ae1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479902/normal_5fe901b8c9fe7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415070/normal_5fe70cd88ac93.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382638/normal_5ff3f037ac0f2.pdfIn PDF document text
    • https://wedisojurul.weebly.com/uploads/1/3/4/5/134515344/8ecda55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459914/normal_602b4aef34b51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462036/normal_60503a992e007.pdfIn PDF document text
    • https://buzapakamewogu.weebly.com/uploads/1/3/4/3/134366326/mifeduvegadelope.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393908/normal_60092219906aa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478670/normal_5fe04f63d15c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419225/normal_5fe9948b5f99e.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://uploads.strikinglycdn.com/files/90ee1590-4428-4ef8-ae4c-8a8b171f565b/62764647012.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f292593-fa71-4e93-9bbb-1c94908a4b8c/how_to_turn_off_low_battery_notification_iphone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4908ee1e-8bf7-4720-a5e6-00da81dda2ea/teledizelosifilibuvesomel.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_off0000e1e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E8 4988 bytes
SHA-256: 5c2513059b3ec562f7217d588e626ad634574e4720475e05fbabaddac0249892
font_01_sfnt_off0000f2f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F4 10820 bytes
SHA-256: d4daf3d826d975e35dae6611bbabd671576fd8b3093288e037c6973462c1a742
font_02_sfnt_off000117c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C0 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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