Malicious PDF — malware analysis report

Static analysis result for SHA-256 aad765130d1980d3…

MALICIOUS

PDF

76.2 KB Created: 2021-03-09 10:57:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 3fb4565574a5902e76201bd1c0ab1596 SHA-1: b08d645e854dec64d0515bc6e3cf282bf52b4400 SHA-256: aad765130d1980d37919d78464aa337c0958c309f4cdf95498b0d1304e3483b8
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 or SEO spam attacks to drive traffic to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as phishing. The embedded URL and the heuristic for a PDF link farm point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://botokaw.ru/wix?keyword=go+math+enrich+grade+3+answers PDF link annotation
    • http://sberpodarok2020.online/duel_links_red_eyes_deckmwfdw.pdfIn PDF document text
    • http://virubedasiv.22web.org/bitlocker_android_apk.pdfIn PDF document text
    • http://mybatut.store/428166517459fgaw.pdfIn PDF document text
    • http://pusosokus.iblogger.org/74152629405.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fe92b815-f0fe-4223-924b-659339f44b90.filesusr.com/ugd/8f64fc_ac7d0979d6e04e1d853f80b396e8207b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zosevid/67574469844.pdfIn PDF document text
    • https://s3.amazonaws.com/tibitexil/general_comments_for_report_cards_middle_school.pdfIn PDF document text
    • https://s3.amazonaws.com/pukiza/new_gems_english_reader_class_5_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/muxegeza/64178766714.pdfIn PDF document text
    • https://b1706aec-e9b1-4c6c-9a93-f14ef4a1c402.filesusr.com/ugd/3b47cb_8822cb79c2f04ac0b6a69cbe4a15114b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tokit/33889208327.pdfIn PDF document text
    • https://s3.amazonaws.com/sinamozagemoger/tikedisetilalumedameb.pdfIn PDF document text
    • https://s3.amazonaws.com/pekatikisuruki/amortization_chart_free.pdfIn PDF document text
    • https://f1ddcea9-c323-452c-a4d3-aaefec61e50a.filesusr.com/ugd/defd8a_3208fee0d64349b7918bd128566c88c1.pdf?index=trueIn PDF document text
    • https://fed4949e-3809-4fc0-a28b-84c5d390f589.filesusr.com/ugd/94482e_48bc734dc9cd4b8b8d5db8af4348309f.pdf?index=trueIn PDF document text
    • https://9cf5cc10-3c2e-4e30-ae6b-73ed7beed88a.filesusr.com/ugd/5c2b46_96c2c2027be44250bc14b5b4465ee7f3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/degisapemifa/titanosejobim.pdfIn PDF document text
    • http://datidogebe.epizy.com/android_snackbar_set_time.pdfIn PDF document text
    • https://b81e1767-bb0d-4562-9f98-cfef66859bb1.filesusr.com/ugd/b48b60_c3094417332449c883aa13d656e16d60.pdf?index=trueIn PDF document text
    • https://a04ad255-06d6-4b17-97e7-91173d300295.filesusr.com/ugd/6864df_277527f3d5c3409fa11b2e6d8a8ef6da.pdf?index=trueIn PDF document text
    • http://bixasejefo.rf.gd/kewupugefitubamowof.pdfIn PDF document text
    • https://cd29ef07-728f-4a0b-b57b-23e770395c36.filesusr.com/ugd/f14cf6_e35022a4a5ea44aebada5b0d5daae325.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/vuzaxipamifo.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8E 5608 bytes
SHA-256: a3b75eb065696f4b3fd43d110ded4b9bcd046a25fa3d2018f3faa056ebe07c31
font_01_sfnt_off00010080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10080 10276 bytes
SHA-256: 3b170b405c748effae97dc068702893460fd24df89e5bab4d488e169cba7838d

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