Malicious PDF — malware analysis report

Static analysis result for SHA-256 4605f1745ed3a4ce…

MALICIOUS

PDF

69.8 KB Created: 2021-05-22 22:15:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 4b185f2cdb4bad081f93ef1c6c3e1353 SHA-1: 6149b437da38c6c7aab0a75c6e918776b83e44c0 SHA-256: 4605f1745ed3a4ce668d1329602a121508ecf88a56a1940467f0f0ea0c1079bd
156 Risk Score

Malware Insights

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

The PDF file contains a mass of external links, many of which are likely part of a link farm designed to manipulate search engine results. One prominent URL, 'https://jacksth.ru/strik?utm_term=how+do+i+change+my+4+digit+schlage+code', suggests a phishing or scam attempt by posing as a helpful guide. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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+do+i+change+my+4+digit+schlage+code PDF link annotation
    • https://kevavakupote.weebly.com/uploads/1/3/4/3/134324476/adb2a504ee04c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463264/normal_601d249621532.pdfIn PDF document text
    • https://vobawele.weebly.com/uploads/1/3/5/3/135334277/3892608.pdfIn PDF document text
    • https://sosufafa.weebly.com/uploads/1/3/4/8/134862430/jumef_pinutako_xubetoredenuk_nojuvowizeron.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481285/normal_5ff90e38d0c9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490523/normal_6041e2863f705.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458856/normal_60586b81a2182.pdfIn PDF document text
    • https://tovozilulu.weebly.com/uploads/1/3/0/8/130873983/338fe1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446015/normal_5ffdbd5aaf58d.pdfIn PDF document text
    • https://nobewiga.weebly.com/uploads/1/3/5/3/135315034/vitiwi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490272/normal_6064fca822c03.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/wazorixekunafob/68324046095.pdfIn PDF document text
    • https://s3.amazonaws.com/luxaduzimase/5174628177.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1719fc9-cccd-4771-af3e-ed356662d4d4/low_calorie_vegetarian_diet_plan_for_weight_loss.pdfIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/tattoo_designs_for_adventure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d32f7718-5de5-4205-aa41-312dca491c37/delta_planer_model_22-580_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/tobaziw/61580947715.pdfIn PDF document text
    • https://s3.amazonaws.com/feseni/auralic_taurus_mk2_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/wotodedaruzuk/amazon_music_quality.pdfIn PDF document text
    • https://s3.amazonaws.com/nigimul/must_see_series_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d62bcb98-566f-4964-97fe-0af8dce5a63d/99972862438.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c804069-5122-45d5-b607-c12d795e2315/amazon_kindle_3_replacement_battery.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_off0000d2fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2FD 5500 bytes
SHA-256: 039dc22bc29e1566aa8ce7ef29e2c1aa0d1ccb28e33408a95a63b6653d795bea
font_01_sfnt_off0000e5b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B1 10540 bytes
SHA-256: d73329eea7f53e69bfb70b24198259c396283bb00aaa2b0890310ff45c96e054

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