Malicious PDF — malware analysis report

Static analysis result for SHA-256 b06611b9d76a9738…

MALICIOUS

PDF

91.2 KB Created: 2021-04-04 20:07:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 05cffbe64885ece221d57530f6f11cc8 SHA-1: e8a4ac50300988ac3a5613aa1e3da628f6ee1705 SHA-256: b06611b9d76a9738add38dc9f3a338b51c72cf73d5227e58d40671fe8b5662ce
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, with one prominent URL pointing to 'pelibifir.ru'. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and the high number of external links suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://pelibifir.ru/award?keyword=breast+cancer+causes+and+treatment+pdf PDF link annotation
    • http://pupesotiv.22web.org/girl_with_the_dragon_tattoo_full_movie_with_english_subtitles.pdfIn PDF document text
    • https://sitoluvumoroge.weebly.com/uploads/1/3/4/7/134762666/9e09b.pdfIn PDF document text
    • http://dunijekunabov.22web.org/9046992842.pdfIn PDF document text
    • https://gusagipo.weebly.com/uploads/1/3/4/0/134017144/93fc543c94f786.pdfIn PDF document text
    • https://vusiwofadenu.weebly.com/uploads/1/3/4/2/134265349/6228389.pdfIn PDF document text
    • https://bujubupe.weebly.com/uploads/1/3/1/4/131437121/dijal.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://smc.org.in)MeeraRegularMeera2016SMC7.0.0+20171102HussainIn PDF document text
    • http://smc.org.inhttp://smc.org.inIn PDF document text
    • https://s3.amazonaws.com/wujafivabipo/goosebumps_2_parent_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/zuniverijesud/borges_and_i_essay.pdfIn PDF document text
    • https://s3.amazonaws.com/sudevejerifu/deep_frying_temperature_guide.pdfIn PDF document text
    • https://19d8af67-ac20-4a7c-8ffd-69be953788a8.filesusr.com/ugd/578741_0f88ab6915094d81b0a692d532136540.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/senodiw/rugolusowirenikuniw.pdfIn PDF document text
    • https://c63ca81c-6df4-4ec3-bc2e-8508f29a6879.filesusr.com/ugd/d48fe3_3d0953b601004254bec86798a19ab834.pdf?index=trueIn PDF document text
    • http://xoxuwev.rf.gd/77651475810.pdfIn PDF document text
    • https://291e86d0-b4b7-455e-aeca-30cd05102b29.filesusr.com/ugd/384a46_da560e312a0349db9c020c5752f8e961.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jeromisixinolib/aerial_fire_game.pdfIn PDF document text
    • https://s3.amazonaws.com/gupawupigawono/new_bhojpuri_movie_sangharsh_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/nafoxa.pdfIn PDF document text
    • https://s3.amazonaws.com/figugipopar/wadego.pdfIn PDF document text
    • https://cf2e1f24-e5f1-4289-9567-3affce9c164e.filesusr.com/ugd/a4ea6c_a6f8ac8390f54f78884212a289753ec6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zinudipir/from_inquiry_to_academic_writing_free.pdfIn PDF document text
    • http://wibiteripu.epizy.com/weekly_calendar_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/sazomo/ssc_admit_card_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/48286628950.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
    • https://gitlab.com/smc/meera/blob/master/COPYINGIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF875 5320 bytes
SHA-256: 3af780a08ed4f6012ecba0bdc4303026237c20443a5bf23e51055294620f3797
font_01_sfnt_off00010a6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6C 7048 bytes
SHA-256: 00fce3f61eaf89b38bc81bb7c3ab01596c684850c3c93f6ac980757bdd565552
font_02_sfnt_off000122d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D2 11024 bytes
SHA-256: 531fff335982f6dd53491b1dec030ff4ae197f695e1f48946294af0e4d93aad7
font_03_sfnt_off000148c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148C1 16164 bytes
SHA-256: e296a61d2d303e35be9e1a35631556663d2780498efa7e8f3867bf557f172fe6