Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ba80e8347c12a8a…

MALICIOUS

PDF

73.8 KB Created: 2021-05-07 11:00:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 99049607862ce82bea0691dd80692388 SHA-1: 82fcda14e026f593f61c5ace6108d0382ec689e4 SHA-256: 4ba80e8347c12a8ada26dbc86e2041280530203d6fe10399b05a44a68fa6ab79
144 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and a high-risk heuristic firing for a redirector link, indicating malicious intent. The document body, though heavily obfuscated, contains references to 'Ubee router login', suggesting a phishing lure. The primary IOC is the redirector URL which is likely used to host a malicious payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://fokemale.ru/strik?utm_term=ubee+router+login PDF link annotation
    • http://ita-bio.space/fekewizixiwupizejm1uy.pdfIn PDF document text
    • http://verifiedbadge-lnstagram.com/without_conscience_meaning_synonymhouhi.pdfIn PDF document text
    • http://maslovauto.ru/expression_of_quantity_worksheetvkt3d.pdfIn PDF document text
    • http://iglivesupportteam.com/samudrika_lakshanam_shastra_malayalamtfnhw.pdfIn PDF document text
    • http://rukakev.iblogger.org/10168674630.pdfIn PDF document text
    • http://lasns.fun/how_to_pronounce_egyptian_hieroglyphicsn2w5m.pdfIn PDF document text
    • http://subefimajifulik.22web.org/91260788166.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e04e5407-f08b-4f6a-b1ae-83350872b2f1/what_is_an_integrated_headset_on_a_bike_frame.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ae97789-ede2-4b22-ba03-ce3faf14176f/the_way_of_perfection_teresa_of_avila.pdfIn PDF document text
    • https://s3.amazonaws.com/wewiro/nexowepowezitugazekowilar.pdfIn PDF document text
    • https://c1908cc8-b41e-4b5b-ab1c-53d28a7f2745.filesusr.com/ugd/913720_29f2d31fe0d94903a87fa3e8df8213ca.pdf?index=trueIn PDF document text
    • http://mikafametulere.epizy.com/android_phone_charger_port_type.pdfIn PDF document text
    • https://964beff5-d24f-450a-94e2-fa7e9faef44a.filesusr.com/ugd/61158f_064b1688b0b94b5498d9400cdb92e196.pdf?index=trueIn PDF document text
    • https://5926284e-b61c-4ed0-95e5-27b9feedd2c3.filesusr.com/ugd/50c35f_8bb19bc948c547049184b8da5c37da60.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/savukojubusum/moonchild_tarot_deck_amazon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/931dcd84-9a69-4be7-b9a6-eac17adb9c5e/43966131280.pdfIn PDF document text
    • https://s3.amazonaws.com/tugumeb/casio_fx_991es_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc1aaa26-442c-4c9c-80aa-cf381d2d08c4/fewifuzevunox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/835b088f-79a1-4e54-b665-153393851513/87449487629.pdfIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/dictionary_of_celtic_mythology.pdfIn PDF document text
    • https://s3.amazonaws.com/lakadutof/44881875505.pdfIn PDF document text
    • http://nevulera.epizy.com/assured_shorthold_tenancy_agreement_download.pdfIn PDF document text
    • http://zinofamokolete.rf.gd/tanexibufexo.pdfIn PDF document text
    • https://s3.amazonaws.com/patilawasu/play_chess_against_computer_free.pdfIn PDF document text
    • https://s3.amazonaws.com/lusabifef/wozemenakifafudabilunekit.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_off0000e5b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B1 4596 bytes
SHA-256: 895509021ec6eaab8d3ffe32c1574ba3a37efb57c84775a7c5815c1a88c1cda2
font_01_sfnt_off0000f569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF569 10512 bytes
SHA-256: 40dd04b7dd40443a47861224ca74ed727a10e1de9c6605583b228db0882f3bf0