Malicious PDF — malware analysis report

Static analysis result for SHA-256 3263ec61c102637c…

MALICIOUS

PDF

77.3 KB Created: 2020-11-14 20:04:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5f74b4705702994be5599092dee18d61 SHA-1: d491d0c07124224b7389bf0b908461d22386433b SHA-256: 3263ec61c102637c3e10def2079718155c6a747d9ec27ed0c2e57355edee4924
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are generated for SEO purposes, indicating a link farm. One of the primary URLs, 'https://trafficel.ru/strik?utm_term=table+de+multiplication+ce1+pdf', is flagged as unknown reputation, suggesting a malicious intent. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafficel.ru/strik?utm_term=table+de+multiplication+ce1+pdf
    • https://wirukibit.weebly.com/uploads/1/3/0/9/130969322/d0e73e.pdf
    • https://ranerenonosojib.weebly.com/uploads/1/3/1/4/131483420/7412485.pdf
    • https://misopiwulasi.weebly.com/uploads/1/3/1/8/131856666/leralewejozepon.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/005e793e-df04-4b55-bbd0-446cfa45036b/soulcraft_hack_apk_unlimited_gold_and_souls.pdf
    • https://uploads.strikinglycdn.com/files/0faf702f-3d0b-4dc5-88ac-eccca552fdf4/cricut_personal_electronic_cutter_29-0001.pdf
    • https://uploads.strikinglycdn.com/files/2d063ac1-40b3-42f4-9d60-d9df8b81e18b/tpcastt_example_for_the_road_not_taken.pdf
    • https://s3.amazonaws.com/mijedusovineti/systemic_pathology_atlas.pdf
    • https://uploads.strikinglycdn.com/files/1fefe263-9528-43ca-8d89-9466cf7d9803/impuros_legendado_download_utorrente.pdf
    • https://uploads.strikinglycdn.com/files/cf711ee6-db30-416d-92af-a1a6f7f69792/87831995890.pdf
    • https://uploads.strikinglycdn.com/files/017a4be6-de68-4220-8f1d-5da73167f841/pennsylvania_drivers_manual_2020.pdf
    • https://s3.amazonaws.com/jebupofedijakuk/gekuvolegevexujabulorale.pdf
    • https://s3.amazonaws.com/tudawufed/eddie_bauer_guide_pro_alpine_pants_review.pdf
    • https://s3.amazonaws.com/tadovu/tesuvijitiwelajereziz.pdf
    • https://uploads.strikinglycdn.com/files/1a58dcc4-5f34-421f-a33d-7f3a38890018/step_one_worksheet.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d49e.bin
7028a3248d1b8b57b70be63574bdd1eda68f579cac7e54ba89c250a5f02fd222		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD49E 5168 bytes
font_01_sfnt_off0000e621.bin
daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE621 1800 bytes
font_02_sfnt_off0000eeaf.bin
9ee147b4b41f6959ee4258909bfc1a698d526aeeb2bae53da84ccbbb6cb1e216		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAF 10372 bytes
font_03_sfnt_off0001120f.bin
aad9bc0f36eadc3314e08670b59090120051e308b357201f134af3d0b781b2b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1120F 16312 bytes

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