Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf113163099f25a5…

MALICIOUS

PDF

71.6 KB Created: 2021-01-08 08:30:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 8304b97bf8aff0a272dd0a16d2a3f1a6 SHA-1: 2fb461c76af9bcaf9330e7da3bdd6656bf3e6e0b SHA-256: bf113163099f25a54f59ac915e5c6dfa101be1fd9f3066b67aa746cef5ce5b8f
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The embedded URL, 'https://trafffe.ru/aws?utm_term=azure+service+bus+vs+event+hub+performance', is the primary indicator of a phishing or credential harvesting attempt. Although no scripts were explicitly extracted, the PDF structure and the presence of an external URI suggest it's designed to redirect users to a potentially harmful site.

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
  • 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://trafffe.ru/aws?utm_term=azure+service+bus+vs+event+hub+performance PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4416326/normal_5ff7f1f042033.pdfIn PDF document text
    • https://cdn.sqhk.co/wugunifikezu/cRqghjj/prison_break_season_4_episode_23.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459320/normal_5fa36be93915f.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/sutawowirosuvuv/best_linux_os_for_android_development.pdfIn PDF document text
    • https://s3.amazonaws.com/salade/nitij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c294357d-dd3e-4d6a-8e7d-593b25e86a7c/5465387858.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87ee41be-2f75-47ac-b00b-b32fce6f4642/munowuzotuwujojaxodokabur.pdfIn PDF document text
    • https://s3.amazonaws.com/vukujidor/23157687174.pdfIn PDF document text
    • https://s3.amazonaws.com/tosego/lm339_comparator_datasheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e37199bc-cb11-4a3d-8f62-dbe8312f2def/37685889443.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9af637d1-cf43-48ef-90ee-da3ce56d76f5/chevrolet_logo_vector_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f13f328-754e-498f-a531-4864c929722e/victorias_secret_bikini.pdfIn PDF document text
    • https://s3.amazonaws.com/zedilegol/lagu_man_ana_nissa_sabyan.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/64920288555.pdfIn PDF document text
    • https://s3.amazonaws.com/wusone/91756083778.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_off0000cd22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD22 5344 bytes
SHA-256: d51a7dcd427cc00cb439358d1b642a3af973d01a21be5cbfb52af7f887f0220d
font_01_sfnt_off0000df25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF25 10572 bytes
SHA-256: d2fbf4c1649001148a28baceef1b612bdf9a8fd6931f2ee0b0228f4e1c6ec4e0
font_02_sfnt_off00010313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10313 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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