Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f58676e1fff42e9…

MALICIOUS

PDF

77.6 KB Created: 2021-03-31 13:47:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 1531cd696651eea38591fd19d3c0a125 SHA-1: c383c0f881d56761d3aa9c1e680c0884550f7b82 SHA-256: 9f58676e1fff42e940f9d14138e43e6ce50d7f9db3bd0386a4bec651f39d1070
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF file flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs pointing to disposable hosting domains, many of which are identified as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to distribute content or phish users. While no scripts were extracted, the presence of external URIs and the link farm behavior indicate a likely attempt to redirect users to malicious sites.

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://lozipotod.ru/award?keyword=august+2020+calendar+pdf+download PDF link annotation
    • https://cdn.sqhk.co/nikofejujel/K3uhijj/vujevusuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447914/normal_601d674db6ac0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422908/normal_6043fbfd9ac03.pdfIn PDF document text
    • http://tumojis.iblogger.org/american_air_force_rank_insignia.pdfIn PDF document text
    • https://cdn.sqhk.co/fegadosijete/B5ddigw/soccer_kicks_arlington.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444644/normal_605b3683701f7.pdfIn PDF document text
    • http://nawitebexu.medianewsonline.com/pixofolizowepaxosefag.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fabonek.rf.gd/nier_automata_revealing_outfit_guide.pdfIn PDF document text
    • http://zugagib.atwebpages.com/60290636910.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/writing_sentences_worksheets_1st_grade.pdfIn PDF document text
    • http://wegorabeg.atwebpages.com/accord_adjectif_de_couleur_exercice.pdfIn PDF document text
    • http://tuwetixa.epizy.com/fupasulopalogidit.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/yajamana_audio_song_kannada.pdfIn PDF document text
    • http://tegazadolital.rf.gd/2775637236.pdfIn PDF document text
    • http://papetamunamu.epizy.com/15987251861.pdfIn PDF document text
    • https://s3.amazonaws.com/pojikovewijeja/stephen_kings_the_dark_tower_the_gunslinger_the_complete_graphic_novel_series.pdfIn PDF document text
    • http://kubivakov.epizy.com/android_tv_box_uk_review.pdfIn PDF document text
    • http://togujekunigek.rf.gd/bazasuwezotevu.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_off0000f253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF253 5680 bytes
SHA-256: eb67edf7a361280f5b946db846d7a8c43531633be91949af5d5f6b78f5f65e77
font_01_sfnt_off000105d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D8 10280 bytes
SHA-256: 55c776ab10b32827fe4fc9fca2dca61a306ec517e8733ef3e7d5b30b9b1df385

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