Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac4c0a61438afbaa…

MALICIOUS

PDF

75.3 KB Created: 2021-04-03 05:59:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6f4d4388f06cf0ebbc66a5b458b1f3bf SHA-1: e64ea2b3d534f3ee1fb8978155b6fb4b03aa848c SHA-256: ac4c0a61438afbaa17d13471b5cd1459f4ccf8144dfc279918bdaab8c5b797cf
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to seemingly unrelated PDF documents, indicative of a link farm or SEO spam tactic. The primary URL, 'https://kuzutuzo.ru/123?utm_term=e+aadhaar++with+face+authentication', suggests a lure related to Aadhaar authentication, likely to phish for credentials or direct users to malicious content. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/123?utm_term=e+aadhaar++with+face+authentication
    • https://zosojelukik.weebly.com/uploads/1/3/1/8/131871698/jefisenudowukol.pdf
    • http://baditunabupiru.mywebcommunity.org/english_basic_grammar_learning_in_tamil.pdf
    • https://gotizede.weebly.com/uploads/1/3/2/6/132695714/fasipol.pdf
    • https://cdn-cms.f-static.net/uploads/4393189/normal_6048c6d668c61.pdf
    • https://cdn-cms.f-static.net/uploads/4474720/normal_5fd14d85c7088.pdf
    • https://cdn-cms.f-static.net/uploads/4408992/normal_603c26af3d1c1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c1fa7ca7-a72f-4053-8a79-7aab3ad9f166/can_you_cook_chicken_in_a_airfryer.pdf
    • https://s3.amazonaws.com/ropidadegaxut/bilufezutamu.pdf
    • https://uploads.strikinglycdn.com/files/16c6de24-3264-42a5-933c-e5b4d4620242/how_to_hold_a_lacrosse_goalie_stick.pdf
    • http://kojenixerog.myartsonline.com/jusoke.pdf
    • https://uploads.strikinglycdn.com/files/0bc82b20-a4fb-4972-a678-ab7ae3849cd3/the_road_to_el_dorado_miguel_x_reader.pdf
    • http://jaxunukologefis.onlinewebshop.net/automatically_delete_blank_pages.pdf
    • https://s3.amazonaws.com/zukogi/71917453672.pdf
    • https://s3.amazonaws.com/fekaduvopigab/asos_women_s_dress_size_guide.pdf
    • https://uploads.strikinglycdn.com/files/017a6449-9986-4a4b-a6e6-76b21d915c92/puwuwekefimemubozawizusas.pdf
    • https://uploads.strikinglycdn.com/files/a5a74216-ae12-4b85-82c6-c6944b61e928/what_is_meant_by_training_of_artificial_neural_networks.pdf
    • https://uploads.strikinglycdn.com/files/0475d37c-0ed1-4df2-838c-666dd9aefe59/2002_ford_explorer_v8_transmission_problems.pdf
    • https://uploads.strikinglycdn.com/files/965f6842-5323-4ad7-9309-e14c26977b15/79411125561.pdf
    • https://s3.amazonaws.com/tarajix/how_to_get_into_navy_seal_training.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_off0000ea45.bin
082d5c0034a73e110677f25e5ba14e31c7e978b3706fcf370f41c0d791eb2c21		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA45 4948 bytes
font_01_sfnt_off0000fb2c.bin
dc155c3898763bfdae1532b20392bd539689ad35e2432a7be32977fc37179549		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2C 10864 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.