Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd11892b9790e614…

MALICIOUS

PDF

70.8 KB Created: 2021-03-22 17:08:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d150e1f33f7e9f9cc1ad6f252b2a14a8 SHA-1: 0102a49e98b2151e6884ae63994b9774a75e2076 SHA-256: cd11892b9790e614ec8ccc938a65fd35af585bdde25b05a772d15094f015adb0
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed to inflate search engine rankings. The primary external URI, 'https://botokaw.ru/wix?keyword=female+tour+guide+in+manila', suggests a lure related to tour guides. ClamAV and ML classifiers strongly indicate malicious content, specifically a phishing or trojan distribution attempt. No scripts were extracted, but the PDF structure itself facilitates the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://botokaw.ru/wix?keyword=female+tour+guide+in+manila
    • https://static.s123-cdn-static.com/uploads/4416490/normal_6007e0e4c7b73.pdf
    • https://banodita.weebly.com/uploads/1/3/4/3/134311275/pufenubedeb-satidivusuku-mokifabuto.pdf
    • https://rukufutuseju.weebly.com/uploads/1/3/4/7/134748195/40f440622ff.pdf
    • https://cdn-cms.f-static.net/uploads/4421038/normal_6055ac8b87623.pdf
    • https://cdn-cms.f-static.net/uploads/4406806/normal_6039e02f1f007.pdf
    • https://cdn-cms.f-static.net/uploads/4454286/normal_6033b970d871a.pdf
    • https://fevuxutub.weebly.com/uploads/1/3/4/1/134131759/9771472.pdf
    • https://cdn-cms.f-static.net/uploads/4385634/normal_600af5e4a88d0.pdf
    • https://nuwosalu.weebly.com/uploads/1/3/4/4/134497214/silavemejexama.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dopugaxelelema/vimivuzidujepelomoziguwan.pdf
    • https://s3.amazonaws.com/pazerogasarinu/ielts_fever_listening_test_29_answers.pdf
    • http://mobosefevexaxep.rf.gd/extrusion_blow_moulding_machine.pdf
    • https://s3.amazonaws.com/wexoteluwag/14422097863.pdf
    • http://fepexajimejisim.epizy.com/read_surah_yaseen_with_urdu_translation.pdf
    • https://s3.amazonaws.com/dejazuvorira/37539579081.pdf
    • https://s3.amazonaws.com/midizaxopazeji/adp_paycheck_template.pdf
    • https://s3.amazonaws.com/tevigotu/nazomemite.pdf
    • http://gotozorij.epizy.com/dictionnaire_franais.pdf
    • https://uploads.strikinglycdn.com/files/7989429b-f875-403d-a33c-063093f3e3f6/how_much_is_hyperbaric_oxygen_therapy.pdf
    • https://uploads.strikinglycdn.com/files/68f89cd9-e02f-4515-b06d-08bf8a7ef8f6/lofugizanixokalabuj.pdf
    • https://s3.amazonaws.com/xewamejixolefaj/art_in_theory_the_west_in_the_world.pdf
    • http://kusefiselarezex.epizy.com/93018802101.pdf
    • https://s3.amazonaws.com/vonusirukete/till_there_was_you_beatles_sheet_music.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8a6.bin
170370f7e3a97a11944500e63db4059509a7a31ef8e18b7fba001df42de6edb6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A6 4924 bytes
font_01_sfnt_off0000e94a.bin
92c8890a1395355d15367f693a0c0ae77de9a33da7d9b0f3425e9892c3888fce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE94A 10856 bytes

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