Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc5c97df666aa1c9…

MALICIOUS

PDF

78.5 KB Created: 2021-02-21 07:40:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 35134dc4dda5e85f482479fec8ccb721 SHA-1: 975091ceddc782baaed30a006cd0fb11deb9519d SHA-256: bc5c97df666aa1c9aa23575c032bb69bec1843d0ffadcb6fc34829900ba487cb
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 4

  • 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/wix?keyword=asdasdasdasd+ne+demek PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4485005/normal_5fe2b315f2636.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385020/normal_5fcc3c77140e0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408871/normal_5fcd99cc69c3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418365/normal_600bb2dfb76db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379614/normal_5fd3127ac3e7f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461245/normal_5fe2f8bcbbe70.pdfIn PDF document text
    • https://cdn.sqhk.co/xezufulozuwo/fJHibha/hoppenhelm_weapons_list.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481675/normal_5fedd55cdd5e8.pdfIn PDF document text
    • https://cdn.sqhk.co/ranemagesoga/eCLL0SR/english_short_stories_for_intermediate_learners_download.pdfIn PDF document text
    • http://vexasemigema.iblogger.org/72294340393.pdfIn PDF document text
    • http://fukoxonezadanom.22web.org/88130376139.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454808/normal_6010cb1cc5a48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467955/normal_602f5169c2fab.pdfIn PDF document text
    • https://cdn.sqhk.co/xovepejegosi/ghe3Ege/43072181761.pdfIn PDF document text
    • https://cdn.sqhk.co/xewasejeve/jbighib/mujodidonibisasoxifovabe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rixuzomobe.epizy.com/animation_creator_software_for_pc_free.pdfIn PDF document text
    • https://s3.amazonaws.com/gopuze/jovoxujawosapeja.pdfIn PDF document text
    • https://s3.amazonaws.com/rogugagatuf/chernobyl_s01e05_reddit.pdfIn PDF document text
    • http://jopewadakos.epizy.com/pumulovekofu.pdfIn PDF document text
    • http://xumizaxojumiko.epizy.com/22211318650.pdfIn PDF document text
    • https://s3.amazonaws.com/sorapobuk/26783186222.pdfIn PDF document text
    • http://zodejewab.epizy.com/jumbled_sentences_exercise_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/gorajikunobixi/flywheels_transformers_wiki.pdfIn PDF document text
    • http://rojomiv.rf.gd/good_warrior_cat_names_for_toms.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_off0000f3f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F1 4896 bytes
SHA-256: 08982d774baa009ace503067b0efd3987016001c714c485ce4c18fa89e06ba1f
font_01_sfnt_off0001048a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1048A 12512 bytes
SHA-256: 617e4f921616aa9d5f31483ff616b1ff0c88187eb6c8b40fe074baa8fcd5d681

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