Malicious PDF — malware analysis report

Static analysis result for SHA-256 824960446f42acc7…

MALICIOUS

PDF

106.8 KB Created: 2021-03-18 11:27:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de3e0dcecba52ba148093dc15ed9d57e SHA-1: 7464ca88ce0c33608fb2fe8fd2797414e88b4e75 SHA-256: 824960446f42acc78127c810c7d81081c281fc9d6cbcd68aed89670ddbdeb8b4
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used in link farm attacks or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the presence of many external URLs suggests the document's primary purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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-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://botokaw.ru/wix?keyword=predicting+precipitation+and+acid-base+reactions+worksheet
    • http://vinnipoh.fun/sparknotes_annie_john_chapter_5g6mj6.pdf
    • https://cdn.sqhk.co/moturalogupe/36jbTjc/88394959977.pdf
    • https://cdn.sqhk.co/pikukafil/gihjigR/67159519883.pdf
    • http://expo-kit.ru/50130736374g06a1.pdf
    • https://cdn.sqhk.co/sivadapexiri/j2ggBF0/beautiful_wallpaper_images_for_whatsapp.pdf
    • http://kafujaguvo.mygamesonline.org/56180423969.pdf
    • https://cdn.sqhk.co/geruvijiwiw/gIgjpgj/56712687138.pdf
    • https://cdn.sqhk.co/musutalivun/cbfhofM/39285512217.pdf
    • http://kexedeziferu.sportsontheweb.net/amla_plantation_project_report.pdf
    • http://jakesubinosol.scienceontheweb.net/bittersweet_symphony_piano.pdf
    • http://mx50off.pro/lazakopugifepofusij8cpv.pdf
    • http://labebatazavanoz.mygamesonline.org/edit_pages_order_online.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cd70d4e5-4a1a-4071-96d1-f2415ea5ece1.filesusr.com/ugd/7f46b5_19a228cf315f4c0f894f62ff2ecac1c8.pdf?index=true
    • https://0d555108-1732-4721-8d72-76d747b2053a.filesusr.com/ugd/1b0481_141c98ffade044dc8b26587733ee3e3e.pdf?index=true
    • https://s3.amazonaws.com/pibabopuduj/36930851580.pdf
    • https://c6926203-1eb9-401e-9afa-11f61f201807.filesusr.com/ugd/685707_628531ef49e24b8d85f8fcc9ca8e2175.pdf?index=true
    • https://15e12281-0fef-4bb1-b284-2b61ddec1698.filesusr.com/ugd/6c5390_4637629800914c3799135ae0d644f8c3.pdf?index=true
    • https://4e4301d6-cc9a-4939-960a-6b497c1efea6.filesusr.com/ugd/d78803_79f1c7ce682943e590a2f224af138a0b.pdf?index=true
    • https://s3.amazonaws.com/xojafemori/33382615218.pdf
    • https://bf6af823-cb0d-4ee8-9d5b-4f0b1de5ed24.filesusr.com/ugd/9eb187_2d3e4bbb7c134701918bf237c803635f.pdf?index=true
    • https://8ed7b8cb-9bae-4def-ad9b-66b28cd11f91.filesusr.com/ugd/740d8c_30b81cca694e4cac85c8e6ff860b1d67.pdf?index=true
    • https://ce2645ba-e89a-43d5-afff-5c0150757291.filesusr.com/ugd/c63dba_e8bc0566e75e4ff6b60610b359fa7c28.pdf?index=true
    • https://s3.amazonaws.com/votuweroxigezog/describe_your_personality_interview_question_answer.pdf
    • https://8e12fe21-47c1-448c-af9e-883e7c84523b.filesusr.com/ugd/52ac5e_ecbd85e02d99436fa115e23b43c5ee27.pdf?index=true
    • http://wadoromutisagar.myartsonline.com/49910032617.pdf
    • https://88e92b2d-3ddf-41b2-a2ae-4af48bfba274.filesusr.com/ugd/b74686_1657206ae20e4e42bd27e6ed97a65cef.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_off000160e7.bin
b36f021e04677c1799e25ef1d59a6741842608882c29d93d146827d7b6edfd8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x160E7 5632 bytes
font_01_sfnt_off0001741a.bin
281aaf173a5e563c7de2d08a82723338e693f85a493b36925f7839dc97db0789		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1741A 11832 bytes

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