Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f1b4a92169fb826…

MALICIOUS

PDF

76.7 KB Created: 2021-03-27 17:57:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 1ada5aebd89939d426f01b7d804ce443 SHA-1: 97c8ea47efc368ebb2edfbd1ffa9d4b6d9c74078 SHA-256: 8f1b4a92169fb826e859f102b6b2875d45d58ba5be23a146c55a83a5189c0fd7
126 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm and has been flagged by a machine learning classifier and ClamAV as malicious. The embedded URL points to a suspicious domain, likely serving as a lure for users interested in 'wifi analyzer apkpure'. Although the document body is heavily obfuscated, the presence of external URIs and the overall detection suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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/wix?keyword=wifi+analyzer+apkpure PDF link annotation
    • http://forajadafogaxuv.medianewsonline.com/gexirojenow.pdfIn PDF document text
    • http://gomesuzos.mypressonline.com/93895181848.pdfIn PDF document text
    • http://vimobewawulipiz.mypressonline.com/curso_de_economia_gratis.pdfIn PDF document text
    • http://tirudibemaj.22web.org/88123970038.pdfIn PDF document text
    • http://gufutaca3.xyz/mavejeniwoduduxaps6g6q.pdfIn PDF document text
    • http://bubble1.space/minn_kota_talon_mountjwuse.pdfIn PDF document text
    • http://myshoes.moscow/nexebiposedirozozeloa2ns.pdfIn PDF document text
    • http://maleev.online/5444416366706ff4.pdfIn PDF document text
    • http://ramedefinu.getenjoyment.net/eritema_toxico_pediatria.pdfIn PDF document text
    • http://creditreportusa.info/15374531147nbelp.pdfIn PDF document text
    • http://welitizenowem.mywebcommunity.org/anti_stress_coloring_book.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a7563df4-ba19-4d82-a8a0-b2470d957038.filesusr.com/ugd/61f964_e91697274ade4edda37e7304228250d6.pdf?index=trueIn PDF document text
    • http://varirojemixu.myartsonline.com/2_stroke_diesel_engine_parts_and_functions.pdfIn PDF document text
    • https://09d56968-2ae9-412d-ad86-e67dc63a1c23.filesusr.com/ugd/e8b91f_0ac5688e628a4aeebb2fa53ed53c6183.pdf?index=trueIn PDF document text
    • https://c02a3fa2-970f-4384-b4fa-7a60184a1b73.filesusr.com/ugd/1da3fe_e7db5b30e3694738bf8723443e578830.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2767ae3-27f4-4713-9656-17eeac1c8bfe/4233068824.pdfIn PDF document text
    • http://dolinoko.atwebpages.com/bihar_si_syllabus_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f7a7318-a629-4ed0-a9bd-2405945b96cb/asus_p8z77_v_pro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94eb23f8-4460-4ff5-b8f1-f46a10492dbd/the_secret_garden_musical_characters.pdfIn PDF document text
    • http://lelekon.epizy.com/fbi_id_card_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/192689aa-5d92-4271-9f0f-3aecc6ddd0da/crosman_model_1077_magazine.pdfIn PDF document text
    • http://rujunigowe.epizy.com/65000015770.pdfIn PDF document text
    • http://teditobu.rf.gd/xesometumuxapenuji.pdfIn PDF document text
    • https://2acf176d-1645-44e4-83be-c67f7ac9af6b.filesusr.com/ugd/e72dd6_38248f87982c43ef9b57e5b09b67c08a.pdf?index=trueIn PDF document text
    • http://fubavinexazixo.onlinewebshop.net/61216380759.pdfIn PDF document text
    • https://c83cbd6e-a134-4b49-ba12-49f24c654ad9.filesusr.com/ugd/904a8b_0b5d382dc25a418fb8f4e6f151fec141.pdf?index=trueIn 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_off0000db70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB70 4948 bytes
SHA-256: 9f699982241bf21895403ce93cbc3beaf44198d7106fbf903c34736a1c34053e
font_01_sfnt_off0000ec7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7A 10148 bytes
SHA-256: df23df7bb2830e9f21610fe787b93d43533c6f24e1209a12d3ee305c6a20ae82
font_02_sfnt_off00010f83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F83 16136 bytes
SHA-256: 7a9f27d6beb5450095a8a290a0faee6c767b21105afdb5a479b57bfb6fb9ad8f