Malicious PDF — malware analysis report

Static analysis result for SHA-256 827411141d205c16…

MALICIOUS

PDF

108.0 KB Created: 2021-01-09 17:34:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 13242fb1741ed9a11cded1d94f3e5e86 SHA-1: 73560d4aa05f3afd63c312d78b5d3c5af54e65f5 SHA-256: 827411141d205c1685ff2a27a374cd34128f99fbc8cdb9292509e10e80368dbc
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 pointing to S3 buckets, which is characteristic of a link farm or SEO manipulation. One critical heuristic identified a 'PDF_SEO_LINK_FARM' with 29 external links. The ClamAV detection and ML classifier also flagged the file as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the PDF structure and the presence of numerous external links suggest an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafftec.ru/aws?utm_term=aneurisma+aortico+abdominal+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379032/normal_5f96624f242b6.pdfIn PDF document text
    • https://xujuwoxevosu.weebly.com/uploads/1/3/4/8/134896670/libuvoseti-todiwenegudet-xujevofe-nubodedugokoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379839/normal_5f9374d48bef0.pdfIn PDF document text
    • https://kevujabuguve.weebly.com/uploads/1/3/4/7/134745112/werimifodamegu-zazil.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365586/normal_5fcaca6f2fa8d.pdfIn PDF document text
    • https://sokexuwog.weebly.com/uploads/1/3/4/3/134351495/519e963e0c14788.pdfIn PDF document text
    • https://laxopewivizi.weebly.com/uploads/1/3/5/3/135394850/votutalumolun.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/kefefetafij/nunudisoxakuregewugi.pdfIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/mosax.pdfIn PDF document text
    • https://s3.amazonaws.com/temujonuwu/sant_gadge_baba_amravati_university_time_table_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/gitipelut/gray_asexuality_flag.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/he_shall_thunder_in_the_sky.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/boards_and_beyond_quizzes.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015c23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C23 5312 bytes
SHA-256: 6a097e6702ef9d90bae8b35f079251d1fface13ed3f2c7c1aad7f8bc310bff70
font_01_sfnt_off00016e06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E06 11816 bytes
SHA-256: e486675979446ba85a2be391be2fed05e5e844d8e43611c9ce3c56f8af397755
font_02_sfnt_off000194c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x194C4 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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