Malicious PDF — malware analysis report

Static analysis result for SHA-256 06b6f63433acb59b…

MALICIOUS

PDF

80.2 KB Created: 2021-03-19 17:14:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a56b0ae3b378c64d5bf56fbcb51d52c SHA-1: 7ae0716842254601aacafecb47030edb471e9c58 SHA-256: 06b6f63433acb59bdc2c93a0bca6498788e795a920fe4065b350e329c5105da2
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm designed to direct users to potentially malicious sites. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier flagging it as malicious further supports its malicious intent. While no scripts were directly extracted, the PDF structure and link farm behavior suggest it's used to facilitate phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://resalured.ru/aws?utm_term=the+missing+cast+members
    • http://termometr-medikal.site/aabb_tech_manualctb3s.pdf
    • https://cdn.sqhk.co/waxolulum/aDiiyhf/kill_creeper_without_exploding.pdf
    • https://cdn.sqhk.co/pefisemise/FkidYiB/lixotusidixojixesuzeg.pdf
    • http://originalhallyu.com/xegamag2e3bj.pdf
    • https://cdn.sqhk.co/wuvupalib/hcjd9xj/programacion_de_arduino_para_robot_sumo.pdf
    • http://trujillostacoshop.com/alto_saxophone_altissimo_chart50dwv.pdf
    • http://liko-sneakers.com/flip_or_flop_atlanta_youtubebh2s7.pdf
    • http://trychambre.xyz/kixadevero7hwkk.pdf
    • https://cdn.sqhk.co/lijedubejop/ihf1ibq/882562171.pdf
    • https://cdn.sqhk.co/pawekenu/7HOhedr/dikimegi.pdf
    • http://kkkirrreeee.space/lugubanajowetelzsyz6.pdf
    • http://reactivascotia2020.com/what_animals_are_symmetricaloftsf.pdf
    • http://madewithsunshine.com/21807396416gmbtj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e905a76e-7bc1-418c-be29-e8eda1603e86.filesusr.com/ugd/3fb32a_dcbb6340ba964b8099940aa38a134517.pdf?index=true
    • https://s3.amazonaws.com/bezegoluzose/html_email_template_basic.pdf
    • https://s3.amazonaws.com/fofeguj/titanium_appcelerator_tutorial_for_android.pdf
    • https://d99d9bf7-a5e0-49f2-90ac-0d1bc881463d.filesusr.com/ugd/0182ef_155e89e0398c4b9baa3c7d023cfa1d5f.pdf?index=true
    • https://s3.amazonaws.com/bisiku/coca_cola_amatil_sustainability_report_2016.pdf
    • https://s3.amazonaws.com/wazagidonux/56541665485.pdf
    • https://s3.amazonaws.com/kafises/lisopigolibekakas.pdf
    • https://17a6c5a8-0587-4adf-8126-5b439e15a62f.filesusr.com/ugd/54bec1_25cfcee440d7413db2def5f6905567f8.pdf?index=true
    • https://s3.amazonaws.com/viboxikuz/munalupimovizonuv.pdf
    • https://s3.amazonaws.com/somisilegex/desawar_satta_king_online_report_gali_ki.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_off0000f777.bin
67120c31faf6ddd4c83c9487fa4194c5b33169558c8fd2a94d0386053aef62fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF777 5272 bytes
font_01_sfnt_off0001093c.bin
22105eb7cda238f0037dadc33ec49c86e04058b9a12833da46ab6a7b1cf08912		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1093C 12080 bytes

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