Malicious PDF — malware analysis report

Static analysis result for SHA-256 5558f2a61f0cf0c4…

MALICIOUS

PDF

70.3 KB Created: 2021-04-02 19:36:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: a2cf92fe922a82f36cf9dff7f0bcd9de SHA-1: 520a5573886c8615acad4bdb8259e534f5de1120 SHA-256: 5558f2a61f0cf0c4d1e637019126d72c18eb922d5b992e31866b6c134e261943
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation. The document body, though heavily obfuscated, appears to be a lure related to 'benim hocam tyt biyoloji video ders notlar1 pdf'. The presence of numerous external links and the overall structure strongly suggest this file is designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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 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://leonvi.ru/award?keyword=benim+hocam+tyt+biyoloji+video+ders+notlar%25C4%25B1+pdf PDF link annotation
    • http://yewes.space/687577800203bhof.pdfIn PDF document text
    • https://vuxamirajuka.weebly.com/uploads/1/3/6/0/136082549/1641539.pdfIn PDF document text
    • https://nubavusixid.weebly.com/uploads/1/3/5/3/135348304/ronarerukorof-bitij.pdfIn PDF document text
    • https://lesapexif.weebly.com/uploads/1/3/1/6/131637780/7669141.pdfIn PDF document text
    • https://cdn.sqhk.co/wakewafo/iaggPCn/highway_bike_simulator_oyna.pdfIn PDF document text
    • https://gekibevuzoz.weebly.com/uploads/1/3/4/5/134503907/febukavuninanot_sowosa_mowozox.pdfIn PDF document text
    • https://tivubolo.weebly.com/uploads/1/3/1/8/131857038/3045970.pdfIn PDF document text
    • https://cdn.sqhk.co/puvubuzu/haifGBr/hero_xpulse_200_fi_top_speed.pdfIn PDF document text
    • https://xajaxosu.weebly.com/uploads/1/3/5/3/135304217/lijejilodigeba.pdfIn PDF document text
    • https://xarefiliji.weebly.com/uploads/1/3/4/7/134735925/df00ce68800f646.pdfIn PDF document text
    • http://dkmz2.club/how_to_find_slope_and_y_intercept_using_two_pointsivvxp.pdfIn PDF document text
    • https://waxevinibiwe.weebly.com/uploads/1/3/0/9/130969944/mojuzama.pdfIn PDF document text
    • https://deriwofapavuz.weebly.com/uploads/1/3/4/3/134311795/3c8269ede2.pdfIn PDF document text
    • http://smartcoin.design/gajadivatoxudegejorikilmiupd.pdfIn PDF document text
    • https://cdn.sqhk.co/tetolonul/jajcjfv/litedupu.pdfIn PDF document text
    • http://boost-store.net/anecdotal_observation_sheetwiidv.pdfIn PDF document text
    • http://ehaberdevlet.com/denulogojogijhzs.pdfIn PDF document text
    • https://cdn.sqhk.co/dobajinorite/Ojbij3j/91434662494.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c4c18ce-c0c5-4153-b03f-32b712a6e9eb/dark_2_release_date.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cccf0c7-4577-42fe-9262-8fef1d253d64/what_can_i_make_with_jelly_beans.pdfIn PDF document text
    • https://s3.amazonaws.com/pululusodogi/lagu_betrayer_pasukan_berani_mati.pdfIn PDF document text
    • https://s3.amazonaws.com/jusuberu/committee_on_climate_change_aviation_report.pdfIn PDF document text
    • https://s3.amazonaws.com/panokojol/android_tv_box_tx6.pdfIn PDF document text
    • https://s3.amazonaws.com/defujo/introduction_to_automata_theory_languages_and_computation_solutions_for_chapter_4.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuduwonifa/nibukubekesefa.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA6 5852 bytes
SHA-256: d7bf838db5602a19502c94bf55ed13d95a5824fcd212558541c52c3d891fa5e6
font_01_sfnt_off0000e37c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37C 11936 bytes
SHA-256: 8f92aa142b8fd6ca2c3a075450559183151e95697206ad77f725e74983085b70