Malicious PDF — malware analysis report

Static analysis result for SHA-256 f094587e3956ea30…

MALICIOUS

PDF

79.4 KB Created: 2021-06-02 11:56:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: da741af80bfa266ff68d3d12bc4f5c77 SHA-1: 65a68cfb8b71d58ae7f7c9589bb47489a3735a22 SHA-256: f094587e3956ea30b8df1f63d54a17866383fd20de0df8a990aebfb70e2b8856
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or SEO manipulation tactic. The presence of the URL 'https://garglob.ru/pbw?utm_term=the+vegetarian+pdf+korean' and the ML classifier's high confidence score indicate malicious intent. While no scripts were directly extracted, the PDF structure and extensive linking are indicative of a potential phishing or malware distribution vector, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • 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://garglob.ru/pbw?utm_term=the+vegetarian+pdf+korean PDF link annotation
    • https://xifemobagot.weebly.com/uploads/1/3/4/0/134000541/8848192.pdfIn PDF document text
    • https://tenuwikenosex.weebly.com/uploads/1/3/6/0/136082269/59c8d.pdfIn PDF document text
    • https://zubikazosiz.weebly.com/uploads/1/3/4/7/134761183/3308472.pdfIn PDF document text
    • https://dizewipukuride.weebly.com/uploads/1/3/4/6/134615497/kagidaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410433/normal_5fe97264d3a51.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386607/normal_60095bcf9fd07.pdfIn PDF document text
    • https://ladofozaser.weebly.com/uploads/1/3/4/3/134334290/c5fa40941d3d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kirozatijawu.pbworks.com/w/file/fetch/144495735/kendriya_vidyalaya_online_admission_form_2021-22_for_class_2.pdfIn PDF document text
    • http://lekuzax.pbworks.com/w/file/fetch/144413205/jiwojowavalam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f84b0fd7-7ae9-403c-b3e8-0acdba45eef2/kagurotanatumizo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db5b06d6-c2e2-4d2e-939c-609682751031/82480032534.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f7591c4-e7de-46d4-8351-add7592ca26d/fazagadorosemo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06cf145f-ae8f-4755-aced-e0ab45405a1f/pre_writing_worksheets_free_printables.pdfIn PDF document text
    • http://nugewus.pbworks.com/w/file/fetch/144491760/exercices_les_familles_de_mots_cm2.pdfIn PDF document text
    • http://luwivaj.pbworks.com/w/file/fetch/144498618/27932813587.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8677754-8e6e-41b2-b0e0-99df1c07e4b3/the_devil_is_a_part_timer_manga_chapter_after_anime.pdfIn PDF document text
    • http://pamotekegopa.pbworks.com/w/file/fetch/144445680/27277791848.pdfIn PDF document text
    • http://sepaxebi.pbworks.com/w/file/fetch/144413208/litesabosidasuguze.pdfIn PDF document text
    • http://palixazoke.pbworks.com/f/the_easy_way_to_stop_smoking_allen_carr_full.pdfIn PDF document text
    • http://paderukut.pbworks.com/f/59418370352.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45cbe9ab-3ac3-4fcf-92be-3cf8438fbe9b/when_will_new_yamaha_rx_100_launch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc7708e1-c04b-4ea4-b164-87466fb03b8b/94128040042.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eba2fee7-2b5f-4d35-b2e6-bc8cead98a5d/gorabano.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE256 5164 bytes
SHA-256: 83903a94814f72ca714b7f484ecc26e7464f92290563ecbc0b7890a47d898989
font_01_sfnt_off0000f3f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F2 12368 bytes
SHA-256: 7c64359f07a54c462f274a1690cd032ed8d2c17238c3884afeadfd050a50b715
font_02_sfnt_off00011b0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0F 16108 bytes
SHA-256: 97e80cc61ebbc6fe4ed03ffd5a5ae1d184ef07adb4204580ef84f3eb02720edc

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