Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ecd99d72dbc6488…

MALICIOUS

PDF

81.6 KB Created: 2021-03-13 12:49:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a3fb5eead701579a1506d41deedf7367 SHA-1: 1160d592612af17d5d4fd5e0730d8a28d91aa911 SHA-256: 1ecd99d72dbc64882ece35b458ccc9c178552cab906fc1f15a700e4350fefb62
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/wix?keyword=ap+statistics+chapter+10+frappy+answers PDF link annotation
    • http://topukovatawosu.sportsontheweb.net/rabejebesowijojade.pdfIn PDF document text
    • http://ellmax-site.xyz/fegav0tbyv.pdfIn PDF document text
    • http://usesoda.pro/21st_birthday_invitation_wording_templates5cko2.pdfIn PDF document text
    • https://gizutiki.weebly.com/uploads/1/3/4/4/134478998/51b15a72f0b200b.pdfIn PDF document text
    • http://sparzha.club/18737018651yligo.pdfIn PDF document text
    • http://tameenegypt.com/vurojiwozonasesigodenotxp0bt.pdfIn PDF document text
    • http://deflecfcvy.best/tupuzexulavofaxop8rx4.pdfIn PDF document text
    • http://rosutob.getenjoyment.net/kolupirijurifimalofomiz.pdfIn PDF document text
    • http://metazoaapc.fun/auditing_assurance_services_6th_editiona8275.pdfIn PDF document text
    • http://hrushch.space/99202749682i2b9o.pdfIn PDF document text
    • https://fafafavavilaba.weebly.com/uploads/1/3/4/8/134893162/jokugeran.pdfIn PDF document text
    • http://jajosez.iblogger.org/38272552114.pdfIn PDF document text
    • http://detonic-official.website/ringtones_for_android_download_mp3kbifi.pdfIn PDF document text
    • http://fojimow.iblogger.org/19598623999.pdfIn PDF document text
    • http://vakisegu.iblogger.org/7440917729.pdfIn PDF document text
    • https://matelusa.weebly.com/uploads/1/3/1/4/131406649/6aec8bd9f1d9b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://rupijelovugibiz.rf.gd/what_are_common_themes_in_american_literature.pdfIn PDF document text
    • http://tawexega.epizy.com/basic_calculus_questions_and_answers.pdfIn PDF document text
    • http://saxodanokijaj.atwebpages.com/13427082362.pdfIn PDF document text
    • http://zalatikewal.atwebpages.com/19157882489.pdfIn PDF document text
    • http://xelidamos.epizy.com/owners_manual_toyota_corolla_2014.pdfIn PDF document text
    • http://zupitatip.atwebpages.com/text-based_questions_for_superman_and_me_by_sherman_alexie_answers.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF304 5128 bytes
SHA-256: 95852f1c23c07000404a8fe264fafd1f34bc6c378227617ef6ea7ca92eb1051e
font_01_sfnt_off00010477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10477 11428 bytes
SHA-256: 78465e3f7468caa0cc9cce644ccd1b6dbeb6422fc5876adb15da24345a9717f8
font_02_sfnt_off00012b56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B56 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c