Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b75c888108a0bd2…

MALICIOUS

PDF

89.8 KB Created: 2021-02-28 14:24:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 63f3214eeacb3ff517174773a5a0bf8d SHA-1: 34631b2a13e0efd5ceca30c6517ded1305cd9415 SHA-256: 2b75c888108a0bd25e2087e483c430dcd5b6c57a497c560e41908ba92eebdebc
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a URL that, when visited, likely prompts the download of a malicious application disguised as an English grammar checker. The presence of embedded URIs and the nature of the ClamAV detection strongly suggest a phishing attempt to trick users into downloading malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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://gimoguvi.ru/wb?keyword=english%20grammar%20checker%20apk PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4424935/normal_5ff1f515df69d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379859/normal_5fccf8567ac21.pdfIn PDF document text
    • http://waxukapotaxakid.iblogger.org/17482343442.pdfIn PDF document text
    • https://cdn.sqhk.co/sejejajoxej/gjXFBhg/jawajabivilogepalu.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/sajatofubote/seliwexavoxido.pdfIn PDF document text
    • https://s3.amazonaws.com/zedilegol/57161983258.pdfIn PDF document text
    • https://s3.amazonaws.com/xewamejixolefaj/zugukesojedaxi.pdfIn PDF document text
    • https://s3.amazonaws.com/pazerogasarinu/gikujeg.pdfIn PDF document text
    • http://likoruta.epizy.com/libros_de_metodologia_dela_investigacion_cientifica.pdfIn PDF document text
    • https://s3.amazonaws.com/wefadep/contract_law_questions_and_answers_book.pdfIn PDF document text
    • http://saliguk.rf.gd/is_subaru_forester_a_reliable_car.pdfIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/cognos_report_studio_hide_column.pdfIn PDF document text
    • https://s3.amazonaws.com/fogibi/concordia_publishing_house_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/fasodek.pdfIn PDF document text
    • https://s3.amazonaws.com/boxalewijim/subtraction_regrouping.pdfIn PDF document text
    • https://s3.amazonaws.com/takebemanijewok/grilled_fish_tacos_nutritional_information.pdfIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/fuzulupugafukiwipa.pdfIn PDF document text
    • https://s3.amazonaws.com/kovilowab/is-_703._a_answers_fema.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E1 5368 bytes
SHA-256: 48058d728dab638eee3d00a54fe9dd565660a0029fa4a4e946b560862fe84dee
font_01_sfnt_off000112ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112FF 11424 bytes
SHA-256: 1c9d19f9c7c9d27584017eb55f6c7290b38ebe57fd6ee0e891b5d8416a627e24
font_02_sfnt_off000139da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139DA 19596 bytes
SHA-256: b6e901eb322a0209c3f9d046f6316ee834f083f64e0dd31e8af7531f4263bcf8

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