Malicious PDF — malware analysis report

Static analysis result for SHA-256 af9ea11f459b560b…

MALICIOUS

PDF

68.8 KB Created: 2021-03-15 10:48:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 32246a495f19df0c0b726838768a6112 SHA-1: ce3a504c320179b673bba9c8c2ef1c1abd2ff994 SHA-256: af9ea11f459b560b73343549737adf1cfea757c84c16daf20a99dbdaa4477c99
126 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. The document body is heavily obfuscated, but the presence of external URIs and the link farm heuristic suggest an attempt to redirect users to potentially malicious sites. No scripts were extracted, but the PDF structure itself is being leveraged for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/award?keyword=ave+maria+gounod+pdf+flute PDF link annotation
    • http://rexevivejegox.scienceontheweb.net/19275686031.pdfIn PDF document text
    • http://artdebug.site/a_time_to_kill_cast_membersw89zf.pdfIn PDF document text
    • https://xatevixi.weebly.com/uploads/1/3/4/6/134651360/4083292.pdfIn PDF document text
    • http://zupurowuzuxule.iblogger.org/samsung_ipolis_camera_price.pdfIn PDF document text
    • http://dmgameplan.com/elder_scrolls_rule34u5t19.pdfIn PDF document text
    • http://amst-watch-v2.club/mawaxxuogu.pdfIn PDF document text
    • http://wovoradomumakil.medianewsonline.com/what_level_is_diary_of_an_awesome_friendly_kid.pdfIn PDF document text
    • http://krepezh.guru/1910257804b0gbx.pdfIn PDF document text
    • http://duvejajenivogik.getenjoyment.net/chacun_sa_route_paroles.pdfIn PDF document text
    • http://xawamiwupajev.mygamesonline.org/baritone_uke_chord_chart.pdfIn PDF document text
    • http://rapejavom.22web.org/22401746532.pdfIn PDF document text
    • https://kerimoseb.weebly.com/uploads/1/3/5/2/135299904/jalinebuxoluno.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sixenogafopoj/74505435854.pdfIn PDF document text
    • http://duvodix.myartsonline.com/dowuderewedatexifururalop.pdfIn PDF document text
    • https://s3.amazonaws.com/falufusu/policy_briefing_template_word.pdfIn PDF document text
    • https://s3.amazonaws.com/nilititonawafim/41547970006.pdfIn PDF document text
    • https://s3.amazonaws.com/lopeteb/greatest_common_factor_problems_with_answers.pdfIn PDF document text
    • http://xuvuzonixo.onlinewebshop.net/5_examples_of_compare_and_contrast_sentences.pdfIn PDF document text
    • http://gamelaluwer.myartsonline.com/introduction_to_python_programming_language.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_off0000ce98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE98 5232 bytes
SHA-256: 118db0e045b5f9f7b5a1afe29b8cd3e2c2438d906bd5ec5ff30f0b860e6672f3
font_01_sfnt_off0000e056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE056 11112 bytes
SHA-256: 21cc439aea566d177c6cc0a6863487860721536c35aeeee87cc17f8bf79ae9de

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