Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b3845cdc2f4adb3…

MALICIOUS

PDF

79.0 KB Created: 2021-05-11 07:26:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 6bc6b1c9e9cc0fba71ecba3feae064fa SHA-1: 3c3050dfd9a5ee3d4e0a050472440e25370630ba SHA-256: 3b3845cdc2f4adb3966c0268b90163468ab7699ca06fd3e5299db9c58c89c14c
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, suggesting a link farm or phishing attempt. The primary URL, 'https://xajibur.ru/strik?utm_term=how+can+i+send+a+video+from+facebook+to+whatsapp+status', is likely a lure to a malicious site. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xajibur.ru/strik?utm_term=how+can+i+send+a+video+from+facebook+to+whatsapp+status PDF link annotation
    • http://bezprovodov.guru/bosewopu6ar38.pdfIn PDF document text
    • https://bivixogerixud.weebly.com/uploads/1/3/4/4/134469213/354773.pdfIn PDF document text
    • https://xugeguva.weebly.com/uploads/1/3/1/4/131438310/292167.pdfIn PDF document text
    • http://vasavomuko.iblogger.org/corrupt_file_sample.pdfIn PDF document text
    • http://puwaxevajineluk.iblogger.org/53231278707.pdfIn PDF document text
    • http://dayzcommunity.info/guitar_songs_to_learn_fingerstylehst3a.pdfIn PDF document text
    • https://zakewurez.weebly.com/uploads/1/3/4/4/134471700/vepas.pdfIn PDF document text
    • https://kexawugidatenak.weebly.com/uploads/1/3/4/3/134338825/firuwodek-ziwawezonok.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pajeriramal/xizufetisusubagofev.pdfIn PDF document text
    • https://4407eba0-147d-4e9d-98ff-19010b67f466.filesusr.com/ugd/c1f2fd_30d2ae6de25a42189ce71f7150eb8bf9.pdf?index=trueIn PDF document text
    • https://4f65501f-cdae-4966-b9db-49b15ad9d196.filesusr.com/ugd/52b593_d5768f862e6641c6b54754f12ae4149b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lukepepe/wafekinakubawa.pdfIn PDF document text
    • https://s3.amazonaws.com/xubifupi/english_daily_words_in_telugu.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/dixarazunovedinol.pdfIn PDF document text
    • https://2f8a6ab9-e864-4757-b083-6627a13f4c48.filesusr.com/ugd/405339_6380245f14c34e998b110810ae5469cf.pdf?index=trueIn PDF document text
    • https://cef8af8d-7071-4339-ac50-fc417d371010.filesusr.com/ugd/a89196_499b4b933f34478689395795a10b5d85.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/redegelesibif/date_picker_react_native_android.pdfIn PDF document text
    • http://fetufebutegiv.rf.gd/amazon_web_services_in_action.pdfIn PDF document text
    • http://jerasopel.epizy.com/11_22_63_clothespin.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_off0000ebe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE4 5680 bytes
SHA-256: 6589a29965c21800cc2b47c77f5a6fc42e4cc04d8adde7fee9c16cc864036b57
font_01_sfnt_off0000ff15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF15 1936 bytes
SHA-256: 7420db9ec41012b263dff8e0d039d2a895961a6b4c1647eabbcd20f441fad98a
font_02_sfnt_off0001085c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085C 11044 bytes
SHA-256: 25e0d5c2c8d8fe03d1092fad61404921795bfe2670a2f70b6950e2e2f69357fe

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