Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a5336c5085ca1dc…

MALICIOUS

PDF

70.4 KB Created: 2020-12-24 02:10:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 4fa24fe75b36e7384e88a9eb25f3499b SHA-1: b222ca78c457a341efddd555ec1a0e8c56e47aff SHA-256: 7a5336c5085ca1dce7a59ccf007c797f0ce649af40139aebe1899e3962ef0d14
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The document contains a mass of external links, many pointing to PDF files, suggesting a link farm or a distribution mechanism for malware. One of the extracted URLs, 'https://trafficel.ru/123?utm_term=scribblenauts+unlimited+apk+pc+free', appears to be a lure for a fake download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafficel.ru/123?utm_term=scribblenauts+unlimited+apk+pc+free PDF link annotation
    • https://gikigafe.weebly.com/uploads/1/3/4/4/134440869/1966750.pdfIn PDF document text
    • https://babinekisifuve.weebly.com/uploads/1/3/2/6/132696104/sexorid.pdfIn PDF document text
    • https://cdn.sqhk.co/mepetiruzi/gdmSZF6/37206737158.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449990/normal_5fe1c11db30c9.pdfIn PDF document text
    • https://xudemogarutigi.weebly.com/uploads/1/3/4/7/134733212/wokari.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/kizugokofo/suwuradagusikovujakag.pdfIn PDF document text
    • https://s3.amazonaws.com/golepe/programa_arquitectonico_de_un_hotel.pdfIn PDF document text
    • https://s3.amazonaws.com/wopari/the_aeneid_book_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74e1b18e-4fce-4fc2-8e68-d215a939a445/35935560989.pdfIn PDF document text
    • https://s3.amazonaws.com/rijaliwiguvex/myo_inositol_and_metformin_taken_together.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_off0000d48e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD48E 5608 bytes
SHA-256: f03266451f021302472c9a5cb5d607baadb2e971299155f10ad5dfeb8f6eecd3
font_01_sfnt_off0000e782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE782 10964 bytes
SHA-256: 6bbee61a0af042c4bc37962e345c790712ff9f48c1d6c64151341c5e4b0ca8fe

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