Malicious PDF — malware analysis report

Static analysis result for SHA-256 18544047ccdf2716…

MALICIOUS

PDF

97.2 KB Created: 2021-03-24 04:06:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 35a0a83567c595f366472018d81686f0 SHA-1: 2e19ff03a1c8b665d7297f0fa2a2b46d27f154ca SHA-256: 18544047ccdf271657f425cdca6534a85fafdd6604fbd4de6948fc9b59b7ecc2
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic firings point to the document acting as a link farm, with numerous embedded URLs directing to potentially malicious or disposable domains. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to phishing or malware distribution sites, likely exploiting the user's interest in TOEFL materials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://golowaki.ru/award?keyword=toefl+reading+passages+pdf PDF link annotation
    • http://1xbet-registrat.site/888113447475eziz.pdfIn PDF document text
    • http://dotixomovi.sportsontheweb.net/42550755977.pdfIn PDF document text
    • http://bilkan.fun/how_to_use_tide_pods_in_lg_top_load_washerq3el0.pdfIn PDF document text
    • http://tcerkovniekupola.space/46934747929dpa98.pdfIn PDF document text
    • http://mavigawika.scienceontheweb.net/how_to_mount_garmin_edge_530.pdfIn PDF document text
    • http://antonio-ita.space/neralejimutizunojuvoxaoj6t3.pdfIn PDF document text
    • https://zefakibafiv.weebly.com/uploads/1/3/1/3/131383453/2599276.pdfIn PDF document text
    • https://xumizobizuzu.weebly.com/uploads/1/3/4/6/134688834/355273.pdfIn PDF document text
    • http://zodelem.mygamesonline.org/what_is_charging_error_1_on_roomba.pdfIn PDF document text
    • http://hookup750.website/teputitilsh37.pdfIn PDF document text
    • http://taxokijoba.sportsontheweb.net/ielts_reading_practice_test_2020.pdfIn PDF document text
    • http://raftgjgr.space/bebafapeperaxizogc1y6v.pdfIn PDF document text
    • http://onlyforyou.space/real_analysis_online_course_stanfordtctvo.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
    • https://37bcb4aa-7747-4ff6-a352-0e22bf983c21.filesusr.com/ugd/4393d3_ff200bdacbe54dde8397607a05f410cf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lekezaru/can_you_recover_from_xanax_addiction.pdfIn PDF document text
    • https://b9e1b105-38e0-4bbf-baad-90de1e2021e1.filesusr.com/ugd/432b07_421f536dc9d24add9d039704d9c8c3c2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gezetega/lola_lago_detective.pdfIn PDF document text
    • https://s3.amazonaws.com/luworizesupox/68106495476.pdfIn PDF document text
    • https://8a833fea-7c9a-4d2e-a5a7-d3590f42a3e5.filesusr.com/ugd/9aab09_2f462eaab9c04e12ac0b5e89c269a049.pdf?index=trueIn PDF document text
    • https://77a80da1-97a3-4b40-ba11-54c6d232eb66.filesusr.com/ugd/39a0fd_3bc77f432b81417ca688e7de36dcde82.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/paxuvagal/bosch_silence_plus_46_dba_parts_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/pukiza/how_to_check_bitmap_size_in_android.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001145b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145B 4864 bytes
SHA-256: 393fd755803fd24769c8f7d9f5ead35e99b54d36083c60959815f4927e3e3c15
font_01_sfnt_off000124e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E1 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_02_sfnt_off00012d6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D6F 10696 bytes
SHA-256: 72a3f564a07e8b756c58803690eeef843fb8172ee9747bbdf0aa0a178ffb1b0e
font_03_sfnt_off00015207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15207 16144 bytes
SHA-256: 18f56b7fae04e07bc119a468ad323bdda099da77b0772854d1c47cc1f39b9f3b
font_04_sfnt_off00016707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16707 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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