Malicious PDF — malware analysis report

Static analysis result for SHA-256 5757ef99af95bd99…

MALICIOUS

PDF

83.6 KB Created: 2021-03-12 11:50:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d4fc31aa7d897cf1558a42d8756259ad SHA-1: b077673a063d7b285633c9a9699fa2bdfdcc9b6a SHA-256: 5757ef99af95bd99ff8e3a9fbcf1bbce8a808e05dac2db2c5f83629881cc8b7d
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 0.9990

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://resalured.ru/123?utm_term=all-+in-+one+toolbox+pro+apk PDF link annotation
    • http://blancop.xyz/49137404441rm8wr.pdfIn PDF document text
    • https://cdn.sqhk.co/tepobugu/gic5PSM/cartoon_splat_sound_effect_wiki.pdfIn PDF document text
    • http://stroiline74.ru/catch_platform_means_whatnblih.pdfIn PDF document text
    • http://velokir.22web.org/18730173019.pdfIn PDF document text
    • http://forkidsshop.online/scroll_template_microsoft_wordwqzen.pdfIn PDF document text
    • http://verifedform.com/the_tattooist_of_auschwitz_book_25fv71.pdfIn PDF document text
    • https://cdn.sqhk.co/rojarimeg/hQ4hgha/beach_buggy_racing_2_cheat_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/moxasapiwer/Fghgfjf/55176775501.pdfIn PDF document text
    • http://fisuruwibowin.66ghz.com/dukuvajufojinupozefe.pdfIn PDF document text
    • http://sallles.ru/51145207289er4il.pdfIn PDF document text
    • http://bigswinner.space/54478975141if3r3.pdfIn PDF document text
    • http://herss.space/ziminexu5sejj.pdfIn PDF document text
    • https://cdn.sqhk.co/gizukakom/djjighc/tasagatonulunip.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gugamofizuxeg.epizy.com/24832712134.pdfIn PDF document text
    • http://gotikomerutoj.rf.gd/24735992056.pdfIn PDF document text
    • http://sejofinudagiji.epizy.com/pesuwufujunefebabonel.pdfIn PDF document text
    • https://45180a89-8b92-4d54-a4c6-cdf0ad6af3c7.filesusr.com/ugd/2b98a3_20f0459d95624b43a812048719788b8f.pdf?index=trueIn PDF document text
    • http://vaguxaza.epizy.com/lodajab.pdfIn PDF document text
    • http://jalafugidovi.epizy.com/how_to_write_a_descriptive_essay_example.pdfIn PDF document text
    • https://df1882fa-13c5-42f1-8438-577935b594b9.filesusr.com/ugd/91932b_fe855afffd9b4617a3a1a80140fd7a85.pdf?index=trueIn PDF document text
    • https://05b56818-8b0b-4484-a411-4f1234233f1c.filesusr.com/ugd/e49726_4c75c05fb6474b71b60f3b74842759d7.pdf?index=trueIn PDF document text
    • https://2b81f3f0-3f46-42ff-87a7-5865dd96cd3c.filesusr.com/ugd/fb41f9_0d3dc9e8065a4adab55f56232fde979e.pdf?index=trueIn PDF document text
    • http://rixuzomobe.epizy.com/real_football_2017_apk_games.pdfIn PDF document text
    • http://fumosuwigerama.epizy.com/35442086026.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_off0000f5d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D4 4928 bytes
SHA-256: 18a4ea0d3db8c5d62b8b50e48d84108066d7a69da1a7a5cc33f17fad7116e292
font_01_sfnt_off000106b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B0 10884 bytes
SHA-256: 7d222fd17dff023e54816945128946b70d742ad6f9e1771a10e6874d7ea19b59
font_02_sfnt_off00012bbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BBC 16144 bytes
SHA-256: f6e0f4a25f18a144688c6b7f40519a5efc98c72643b9054f89526e396d9b459d

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