Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaa4acb766e19aed…

MALICIOUS

PDF

87.0 KB Created: 2021-01-04 16:47:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2794992a01173c4f0717ae5062c184e6 SHA-1: b55d95aacf8917ed5376bd40bf4fac9aa75f08b9 SHA-256: aaa4acb766e19aed83a8d05a6bffaf88da8fc14e51d4e8755eaf5c20128ebca7
156 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a phishing document and hosts a large number of external links, likely for SEO manipulation or to redirect users to malicious sites. The embedded URL points to a suspicious domain, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and heuristics strongly suggest malicious intent, possibly involving JavaScript execution for further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffnew.ru/aws?utm_term=employment+contract+pdf+sample
    • https://cdn-cms.f-static.net/uploads/4488806/normal_5fae8c8669416.pdf
    • https://zetewewab.weebly.com/uploads/1/3/4/4/134479884/5715a9cd3.pdf
    • https://mefemanodi.weebly.com/uploads/1/3/1/4/131454269/detobo_sanulinazenobig.pdf
    • https://gawosiluzetur.weebly.com/uploads/1/3/4/6/134631715/5599040.pdf
    • https://ruwizugaxuluba.weebly.com/uploads/1/3/4/7/134759804/ginedusizanatumibov.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/penefelomiju/terusofaj.pdf
    • https://s3.amazonaws.com/regufojalojaza/funny_quiz_questions_with_answers_in_english.pdf
    • https://s3.amazonaws.com/mesixadelomomo/first_grade_math_worksheets_printable_free.pdf
    • https://s3.amazonaws.com/sizadagazagaj/update_windows_8._1_64_bit.pdf
    • https://s3.amazonaws.com/fodose/chakra_meditation_guided_10_minutes.pdf
    • https://s3.amazonaws.com/gowupuzokowuxes/reddit_pokemon_go_guide.pdf
    • https://s3.amazonaws.com/vojapu/mojuzasige.pdf
    • https://s3.amazonaws.com/tuzamada/95018178883.pdf
    • https://s3.amazonaws.com/midipes/16733022766.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_off000116f4.bin
0dff093de1a76d0aa0976465ec73924bdb5f9874820881f339addad854312d00
pdf-font-stream PDF embedded font (sfnt) at offset 0x116F4 5360 bytes
font_01_sfnt_off00012929.bin
fff3e3879d51ec730124ad35472de26bc8d9046e80d3e0b4f884af90b3e74124
pdf-font-stream PDF embedded font (sfnt) at offset 0x12929 11100 bytes