Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aa8b51b61548bd1…

MALICIOUS

PDF

109.0 KB Created: 2021-03-25 16:36:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a801da4b6cfee8773ba28195fdb19447 SHA-1: 568db4039f6eaef5c4fd1bbabd4f0d81552af363 SHA-256: 1aa8b51b61548bd1c9087c9f2f5d37b11faa435c8f1531f749bfdf4506fa6d85
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. The embedded URLs suggest a phishing or malicious content distribution scheme. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification. While no scripts were explicitly extracted, the PDF structure and link farm indicate an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jumiwimov.ru/award?keyword=avadhuta+gita+malayalam+pdf
    • http://soldatskaya6.ru/naranathu_branthan_lyricslbre0.pdf
    • http://tafiwon.mywebcommunity.org/jezixejufapoxuzuvotubuw.pdf
    • https://lokamafurixese.weebly.com/uploads/1/3/4/5/134509290/notudijemakipe.pdf
    • http://internet-babki.ru/hampton_bay_ac-552_remote_controldav0y.pdf
    • https://palegovod.weebly.com/uploads/1/3/1/0/131070329/a727a173f7.pdf
    • https://sugulidan.weebly.com/uploads/1/3/4/5/134508933/1517025.pdf
    • http://afracheat2.xyz/85111706152ff99c.pdf
    • http://lovepositions.info/molexitixorikoxepetk8fqs.pdf
    • https://lumirofelefepo.weebly.com/uploads/1/3/4/8/134892557/4027836.pdf
    • http://file-id.ru/livopofuluvolarovizekerem2ybwa.pdf
    • http://mitimewigupito.mypressonline.com/9458070462.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://smc.org.in)MeeraRegularMeera2016SMC7.0.0+20171102Hussain
    • http://smc.org.inhttp://smc.org.in
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/warapagefasovi/tezemuwenus.pdf
    • https://6c036dbd-b327-4678-b778-de8a2ee7bb50.filesusr.com/ugd/ed64d2_6df6f4d155d54c94b964e660189b73a9.pdf?index=true
    • https://s3.amazonaws.com/mukutud/how_to_write_a_self_evaluation_for_performance_review.pdf
    • https://89d37d93-eaf9-4fc7-8d5e-07438b8f18e7.filesusr.com/ugd/e80f4c_659ae901d2984745ab1bab7f5f3b2db9.pdf?index=true
    • http://wumafopid.onlinewebshop.net/brave_new_world_themes.pdf
    • https://s3.amazonaws.com/mavixu/consumer_reports_tires_reddit.pdf
    • https://s3.amazonaws.com/wozoxub/antminer_s9i_firmware.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
    • https://gitlab.com/smc/meera/blob/master/COPYING

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f270.bin
7bd127773212a46c9432a6f1fb36fe87ca6e9d7878f05404e3865b13cfb0b6ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF270 4880 bytes
font_01_sfnt_off00010311.bin
c6abb317bd24de8c3ccc33cc41ecedf80dc4b0cf8c4ace7ece0b3cab729d193e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10311 42840 bytes
font_02_sfnt_off000174c7.bin
0471d0833b22e6ab5a2fa020ee923109fc04aab6290cf270e687429fa2e3330b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x174C7 9948 bytes
font_03_sfnt_off000196c3.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x196C3 4324 bytes

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