Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca44bd319e4c1adb…

MALICIOUS

PDF

74.8 KB Created: 2021-02-24 23:09:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 6f8fefd3459034ccee429e7c8edd233c SHA-1: f380cdf1874f6017bde2e0a0da61b8c9668790f2 SHA-256: ca44bd319e4c1adb235d6a8cadb5c7ac9456c72fca7e8636520261fef9546c4c
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious content. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, contains text related to 'english learning app' and metadata from wkhtmltopdf, which could be used as a lure. The presence of external URIs and the overall structure strongly suggest this PDF is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/123?utm_term=best+english+learning+app+for+beginners PDF link annotation
    • http://fajujefa.getenjoyment.net/diary_of_a_wimpy_kid_show_cast.pdfIn PDF document text
    • http://abistrans.ru/mamupimizujixomifowakvvmxl.pdfIn PDF document text
    • http://fakixigulidol.mywebcommunity.org/72542372641.pdfIn PDF document text
    • http://vir-tus.com/rerolipeisqsu.pdfIn PDF document text
    • http://itasummer.fun/vipuxulidirujufasugariku2j8h7.pdfIn PDF document text
    • http://xuwuvewisin.mypressonline.com/lasesiwamanuw.pdfIn PDF document text
    • http://xemizawufogutuf.scienceontheweb.net/how_to_make_a_vrchat_avatar_from_scratch_2020.pdfIn PDF document text
    • http://inmyshtangen.xyz/accelerometer_android_apkiexdr.pdfIn PDF document text
    • http://ronifibofizet.medianewsonline.com/zidonos.pdfIn PDF document text
    • http://retamos.mygamesonline.org/88703076329.pdfIn PDF document text
    • http://lnstagramsupportlives.com/exempel_p_allelopatirz8b3.pdfIn PDF document text
    • http://mivetys.xyz/agni_natchathiram_bgm_freez4xv0.pdfIn PDF document text
    • http://newyearshop.site/problemas_de_sistemas_de_ecuaciones_3x3_resueltos4szg4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lunojol/vodolobepibinum.pdfIn PDF document text
    • https://s3.amazonaws.com/gumagabu/bekata.pdfIn PDF document text
    • http://pusapovewazigu.onlinewebshop.net/kitchenaid_stand_mixer_cover_diy.pdfIn PDF document text
    • https://s3.amazonaws.com/tugumeb/42595921585.pdfIn PDF document text
    • https://s3.amazonaws.com/pexodugosa/bisegota.pdfIn PDF document text
    • http://kivozusemu.atwebpages.com/murray_lawn_tractor_for_sale.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

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE782 5352 bytes
SHA-256: 8861a3286ea1212bbe5d5aae22b03b6b7b336d0dab03b6c579564ed55c25ef1b
font_01_sfnt_off0000f9af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AF 10864 bytes
SHA-256: ab2a6ef804e753083c39c346861d289b708044775c742ddb8e602ddffcb13ab1

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