Malicious PDF — malware analysis report

Static analysis result for SHA-256 43da1342a19fc3cb…

MALICIOUS

PDF

78.7 KB Created: 2021-01-24 19:04:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 105ba28e41f62dc4da27f03f9f8fe3a4 SHA-1: 40a63d90eb18a9f1f3f4ab77f720b125cd40f80b SHA-256: 43da1342a19fc3cb4280e53ae914c7c25cc9195a32cba0e5343103579e23f966
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to educational worksheets, which is a common tactic for phishing or malware distribution. The presence of external URIs and link farm heuristics indicates an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/123?utm_term=triangles+parallel+lines+worksheet+pdf PDF link annotation
    • https://dijamolilum.weebly.com/uploads/1/3/5/3/135347404/7880109.pdfIn PDF document text
    • https://nimaxosonoj.weebly.com/uploads/1/3/4/8/134897368/vabatuxafasuposum.pdfIn PDF document text
    • https://cdn.sqhk.co/jawafurovif/SLggMib/78010220753.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365656/normal_5fe3f29394486.pdfIn PDF document text
    • https://sovuzozasofebod.weebly.com/uploads/1/3/4/3/134343281/4068976.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402932/normal_5fe785fd0cef8.pdfIn PDF document text
    • http://sodobinefudiguw.iblogger.org/63031520376.pdfIn PDF document text
    • http://xeboxemovev.66ghz.com/mall_of_asia_map_guide_inside.pdfIn PDF document text
    • http://geniputan.66ghz.com/como_convertir_cade_simu_a.pdfIn PDF document text
    • https://cdn.sqhk.co/finulepaf/iKbghtM/38089715337.pdfIn PDF document text
    • https://latimemoniborij.weebly.com/uploads/1/3/1/4/131437487/37785a218fc8b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369779/normal_5ff0959a0aa88.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365624/normal_60069fb671b8b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kipixuge.epizy.com/blender_materials_pack.pdfIn PDF document text
    • http://buzurofomurab.rf.gd/adobe_after_effects_google_drive.pdfIn PDF document text
    • http://soxalisaxofaba.epizy.com/age_of_empires_2_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/nademopor/aparato_reproductor_femenino_partes_que_lo_conforman.pdfIn PDF document text
    • https://s3.amazonaws.com/mefonevimimix/next_step_guided_reading_assessment.pdfIn PDF document text
    • http://nozuwodapa.epizy.com/fiocco_allegro_violin_sheet_music.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE09 5408 bytes
SHA-256: 4c3fc90413878ea491ccfc9a5aadf51b80809b02cc5537bfd44a005352227565
font_01_sfnt_off0000f07e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07E 11064 bytes
SHA-256: 1c86365c3f4b2b784016ddd57f90190f8b506dec094f1137c30576c7730edf9c
font_02_sfnt_off00011680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11680 16116 bytes
SHA-256: c7a99dd11b9eef37ed5b1e4d467efef799abc5bbcc742b95847a0722eb3cb5d3

Open this report in the interactive analyzer, or submit your own file for analysis.