Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ad085ed097d599e…

MALICIOUS

PDF

76.3 KB Created: 2021-03-24 18:52:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 96bf61fbb975590ec8ca5559290d1f56 SHA-1: d8f6bac6b2ec9baea8e2f7ad373d4471f43c8d3d SHA-256: 5ad085ed097d599e815cf348990cc87e2bb573f44c7f2c0da2cc033fdf9dcb9a
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 point to PDF files hosted on various domains, suggesting a link farm for SEO manipulation or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or trojan delivery. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ponafet.ru/wix?keyword=comptia+it+fundamentals+study+guide+exam+fc0-u51+pdf+download
    • https://sakuvajavabese.weebly.com/uploads/1/3/1/3/131383602/4822107.pdf
    • http://zurekeboxiba.22web.org/1490002780.pdf
    • https://gutamunimidujad.weebly.com/uploads/1/3/4/6/134667749/gifedejazesuwekuwuvi.pdf
    • https://kojaresojew.weebly.com/uploads/1/3/4/3/134312518/9260519.pdf
    • http://creamwalls.space/niv_audio_bible_download_old_testamentsdhfk.pdf
    • https://mesedegusi.weebly.com/uploads/1/3/4/6/134600151/jofabopab.pdf
    • https://domolijetokuv.weebly.com/uploads/1/3/0/7/130738933/5661728.pdf
    • https://xoririsi.weebly.com/uploads/1/3/4/8/134848275/fimosapusoru_kuvanu_tavanuvi_kafawulub.pdf
    • https://jufapagemegugux.weebly.com/uploads/1/3/4/8/134860181/a852b42.pdf
    • http://tibetterrier.ru/29432565165vqo18.pdf
    • https://takaranedo.weebly.com/uploads/1/3/4/0/134017801/wagalo_titilow_jemuxazurir_jozixonezujere.pdf
    • https://parimuxuroz.weebly.com/uploads/1/3/2/6/132682994/kewanokata.pdf
    • https://labajamipudoxa.weebly.com/uploads/1/3/5/3/135399896/9569485.pdf
    • https://mopopapepiror.weebly.com/uploads/1/3/2/7/132741339/92a199bfd9f6116.pdf
    • http://uabiomanix.xyz/18884929399hinb7.pdf
    • https://wisamifogafize.weebly.com/uploads/1/3/4/5/134598642/zibuxapuneroxepi.pdf
    • https://xojakonokixamu.weebly.com/uploads/1/3/1/1/131164577/monen_kupekidow.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tewapixu.epizy.com/swift_analysis_aptitude_sample_test.pdf
    • https://39472683-7d43-4bc3-882b-0947a83fd973.filesusr.com/ugd/544c7e_e60a367d7fa84c4f8f082d6e879090a6.pdf?index=true
    • http://zuronixo.rf.gd/1st_anniversary_cake_images.pdf
    • http://gasapiloxa.rf.gd/twilight_saga_2008_tamil_dubbed_movie_download_tamilrockers.pdf
    • https://73099f28-10d5-4558-98a1-2f8dc61f1a2f.filesusr.com/ugd/f62eaa_a77c63fdb9ee4f57a4db9408de630571.pdf?index=true
    • 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_off0000e85a.bin
9b3f32accd07d92887f36f55f52f5ff5a733db0e5956ee32aadbb2490ff99f91		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE85A 5896 bytes
font_01_sfnt_off0000fc8f.bin
7f8b6fd50bd5c6c859ec96b88a99b171920d3cb9b15fb6386f9c5a4ce7475be3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8F 11328 bytes

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