Malicious PDF — malware analysis report

Static analysis result for SHA-256 57bdcb7956af69cf…

MALICIOUS

PDF

70.3 KB Created: 2021-04-01 16:46:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4f341303eb459dded00a0755d614fba0 SHA-1: a48e3f7fafbdfa41865ca4eeadd694284b1290d8 SHA-256: 57bdcb7956af69cfbd3fef5ba0e4d6136016ae46cb68f6ed6d59b2b6311f3bbc
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 SEO-themed, suggesting a link farm or phishing attempt. The primary URL, 'https://druttle.ru/wix?keyword=biology+chapter+5+populations+answer+key', is presented as a search result to lure users. While no scripts were explicitly extracted, the PDF structure and numerous external links indicate a malicious intent to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://druttle.ru/wix?keyword=biology+chapter+5+populations+answer+key
    • https://xavimunemu.weebly.com/uploads/1/3/2/8/132815343/suvaruzi-zunomejix-tegod-pulewek.pdf
    • https://rubisese.weebly.com/uploads/1/3/4/5/134589844/rumiluwevej.pdf
    • https://limogugopowara.weebly.com/uploads/1/3/1/6/131637055/gifup.pdf
    • http://pukebebizadolu.mypressonline.com/sokekumosetufodex.pdf
    • http://lnstagramcentre.net/accuair_elevel_height_sensor1xpu7.pdf
    • http://butalinonoruma.scienceontheweb.net/61364450091.pdf
    • http://xsafak.com/ikea_cyber_monday_couponsthr0.pdf
    • http://bimizuzi.sportsontheweb.net/descriptive_research_definition_by_authors.pdf
    • https://poximixej.weebly.com/uploads/1/3/0/7/130776069/2b7cc.pdf
    • http://idealicaitalia-ufficiale.site/casio_wk_110_instruction_manualto7h9.pdf
    • https://dexulana.weebly.com/uploads/1/3/4/2/134234773/joliwesajilu.pdf
    • https://xudubuwar.weebly.com/uploads/1/3/4/0/134041851/4960980.pdf
    • http://lobafor.mypressonline.com/wopugiz.pdf
    • https://robaralimojo.weebly.com/uploads/1/3/0/8/130814718/sewufirofupeboko.pdf
    • https://duparumiwope.weebly.com/uploads/1/3/4/7/134707207/vesalowavog-vokifibiwofapo-jebuko.pdf
    • http://ita-bio.fun/stephen_hawking_young_interviewjezkd.pdf
    • https://kikosezuzo.weebly.com/uploads/1/3/1/3/131378972/b0fe75b78a13.pdf
    • https://zeberafuduzugag.weebly.com/uploads/1/3/2/6/132682167/lasadalufevol-vevabejubogi.pdf
    • https://pomulopegodetom.weebly.com/uploads/1/3/1/3/131384256/kubudibagot_gelajowegesorof_tavipowovomi.pdf
    • https://dopotalufiru.weebly.com/uploads/1/3/4/6/134601398/wutalotibo_zaxetunuzupiwi_kakunosiwali.pdf
    • https://xaxuxogupovugid.weebly.com/uploads/1/3/0/8/130874119/teboravam_zelevibazarelej_mivuxadusoge_wopafesagixol.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dogazisuze/how_do_you_graph_using_a_table_of_values.pdf
    • https://s3.amazonaws.com/patilawasu/man_of_constant_sorrow_chords_in_g.pdf
    • https://s3.amazonaws.com/gawabog/fufideradolapawaloxelema.pdf
    • https://s3.amazonaws.com/legobegutulo/how_to_trade_options_on_stocks.pdf
    • https://s3.amazonaws.com/nilafafakem/92920785679.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d608.bin
4106362e02ec897b135fe0e865b2a6fe67b5be47b13a9193ca56f00051a3c424		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD608 5628 bytes
font_01_sfnt_off0000e94e.bin
ba156654ebd7b86234d44cd5b048851153cf8dbcab8547718b674b7457b84581		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE94E 9900 bytes

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