Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf0b171ba225139e…

MALICIOUS

PDF

75.2 KB Created: 2021-01-19 14:45:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 242ca85875a07aad959e37db66bebf6a SHA-1: 98b8746a098dfa15d9cbe0fb5e15aa0a8e14a910 SHA-256: bf0b171ba225139e712698fd590e2f12df3e0fa92af3193e5d02819cd511e6ec
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing and potential trojan threat. It contains a large number of external links, many pointing to S3 buckets and other domains, suggesting a link farm or redirection scheme. The presence of 'LOLBin token sequence' and the PDF_SEO_LINK_FARM heuristic further support the attack pattern of luring users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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/123?utm_term=georgia+econ+eoct+study+guide PDF link annotation
    • https://xulakuvoloja.weebly.com/uploads/1/3/0/8/130813987/aa0baf.pdfIn macro / runtime command snippet
    • https://runumoviw.weebly.com/uploads/1/3/4/8/134854062/3969053.pdfIn PDF document text
    • https://siregudak.weebly.com/uploads/1/3/0/7/130738759/eef2c8539.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488135/normal_5ff435adcc9b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366384/normal_5f871b1d56200.pdfIn PDF document text
    • https://pavedivagew.weebly.com/uploads/1/3/4/4/134468388/3048375d.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/leteraxewe/conair_instant_heat_curling_iron_3_4_inch.pdfIn PDF document text
    • https://s3.amazonaws.com/wixamupelinere/industrial_ammonia_refrigeration_cycle.pdfIn PDF document text
    • https://s3.amazonaws.com/xeponodij/pexenikesodemaxofatud.pdfIn PDF document text
    • https://s3.amazonaws.com/palevijuj/breakup_shayari_pics.pdfIn PDF document text
    • https://s3.amazonaws.com/tenunud/rujovibekamoradasop.pdfIn PDF document text
    • http://jilerixam.epizy.com/developer_options_android_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/teximikamukubo/35625658599.pdfIn PDF document text
    • https://s3.amazonaws.com/godewumazek/cryptocurrency_trading_book.pdfIn PDF document text
    • https://s3.amazonaws.com/sorapobuk/woxifivudimuxikarem.pdfIn PDF document text
    • https://s3.amazonaws.com/wixamupelinere/bill_of_sale_template_as_is_condition.pdfIn PDF document text
    • https://s3.amazonaws.com/nonipesikiri/zorupaxesupodevime.pdfIn PDF document text
    • http://gazugitub.epizy.com/xixujogevepawesutowokutow.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
    • https://s3.amazonaws.com/wixamupelIn macro / runtime command snippet
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC6 5208 bytes
SHA-256: e1804fd5e59c62a9e43d95bdefd38fd53a54db6a91530e6237b654fba18b7ff4
font_01_sfnt_off0000f092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF092 3720 bytes
SHA-256: a7c194c348f4bc26aad06ae1fa1eadf76503a3aca856ff80314c3d87a816eea9
font_02_sfnt_off0000fbf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF2 10244 bytes
SHA-256: 803ece39ffb2dd34f775956edd996ca8d65a52252db6e7c7ebb21f0c7ab101b5

Open this report in the interactive analyzer, or submit your own file for analysis.