Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a938ee560d3ed90…

MALICIOUS

PDF

76.8 KB Created: 2021-03-23 22:18:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: f728a7df8f4c8e0f12a5999a005afe2b SHA-1: d2d169e617965dd2eddf71a144371ae1ea410378 SHA-256: 3a938ee560d3ed906971554f3f9c2633163cde9e3de9c4e4cc14a8ec53f983de
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' suggest the document is designed to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://jacksth.ru/strik?utm_term=how+much+do+site+reliability+engineers+make PDF link annotation
    • https://dupevolorimix.weebly.com/uploads/1/3/4/5/134588768/46a467f2.pdfIn PDF document text
    • https://xinosete.weebly.com/uploads/1/3/0/9/130968926/375252.pdfIn PDF document text
    • http://revadadijavu.22web.org/nyssma_level_2_piano_sight_reading.pdfIn PDF document text
    • https://nametipij.weebly.com/uploads/1/3/1/1/131164318/1676852.pdfIn PDF document text
    • https://danexuxubusam.weebly.com/uploads/1/3/2/6/132695747/8172998.pdfIn PDF document text
    • https://zelopira.weebly.com/uploads/1/3/5/9/135990333/1f57f7.pdfIn PDF document text
    • http://kikuwufebufelat.iblogger.org/svu_episode_guide_season_7.pdfIn PDF document text
    • https://wevuviwujito.weebly.com/uploads/1/3/1/6/131636984/d752128.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/widofafane/plant_dna_extraction_lab_report_discussion.pdfIn PDF document text
    • https://s3.amazonaws.com/godoremitiwuja/safafogazixowosudezoji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcfae9db-d918-4195-84eb-24236ec60d79/60305666882.pdfIn PDF document text
    • https://s3.amazonaws.com/julexekubaj/vojupojadesatoxaga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d58934dc-296d-4cf9-8035-c7f79c383c84/68054354806.pdfIn PDF document text
    • http://mepaduk.rf.gd/libro_de_historia_de_mexico_primaria_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/wovedukevikov/attire_definition_formal.pdfIn PDF document text
    • http://sesugemedolaf.rf.gd/merchant_of_venice_summary_act_3_scene_5.pdfIn PDF document text
    • https://s3.amazonaws.com/fazujo/how_to_best_write_a_book_report.pdfIn PDF document text
    • https://s3.amazonaws.com/fusidejebi/begipeziw.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/jejijumesibudop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1bf2146-acce-4e44-9c9f-c88f4250a8e5/soleus_air_dehumidifier_gl-deh-70eip-6_pump_not_working.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_off0000ee82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE82 5712 bytes
SHA-256: dd0e39acc7411be2cee3d043dd60bef25076d4a4a812d6e214203cff20ea7062
font_01_sfnt_off000101d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D6 10596 bytes
SHA-256: 8f28548b0718d3b8409b04004f651e5aaba7136b263e79ee937c4f49cbd1387e

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