Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba877371af6a8474…

MALICIOUS

PDF

68.4 KB Created: 2021-01-25 19:13:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 62e2498919b38a96396f8ec80c26eb17 SHA-1: d9b730161a3905639cd496c9be86fab06d3415cb SHA-256: ba877371af6a847453a62d9f1597ad8486f9988fcfdfe647515a7df29685c691
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, and is flagged by heuristics as a link farm. The embedded URL 'https://bologen.ru/123?utm_term=how+many+electrons+does+neon+have' suggests a lure to trick users into clicking. ClamAV detection and ML classification confirm its malicious nature, likely as a phishing or malware distribution vector.

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=how+many+electrons+does+neon+have PDF link annotation
    • https://kakowafalajoji.weebly.com/uploads/1/3/4/4/134455686/b59a6e9010c65.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464082/normal_5fd06d73c9fdc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369183/normal_600aa170db14a.pdfIn PDF document text
    • http://tasunixupowife.66ghz.com/kesilojikofejufibavim.pdfIn PDF document text
    • https://xikoroto.weebly.com/uploads/1/3/4/3/134338579/wudutorefugebizono.pdfIn PDF document text
    • https://powekusazalij.weebly.com/uploads/1/3/2/6/132695596/8764450.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393514/normal_5fdb3bd53156b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415739/normal_5fd958ff1b961.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/nerugiraxura/amharic_bible_commentary_new_testament.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwotarotavuz/good_book_guides_bible_study.pdfIn PDF document text
    • http://xifedesekelogu.epizy.com/asphalt_8_airborne_mod_highly_compressed.pdfIn PDF document text
    • http://ferenekukosazu.epizy.com/naliketaretidanumilozod.pdfIn PDF document text
    • http://tufobiwileke.rf.gd/gofetajanomirasuw.pdfIn PDF document text
    • https://s3.amazonaws.com/wuxupewu/top_android_games_mod.pdfIn PDF document text
    • https://s3.amazonaws.com/savifin/13221196636.pdfIn PDF document text
    • http://zapudeni.epizy.com/surah_al_mulk_terjemahan.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c0c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0C6 5136 bytes
SHA-256: 6c1f05b24b422ab555988aea6e80a0b71d926164cd3ff50ee30b0f8257cffc42
font_01_sfnt_off0000d219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD219 10736 bytes
SHA-256: 782c1e7743804ab5524b92c592829d4a0721a7e843b1ccbd598bb28a2d4e2d99
font_02_sfnt_off0000f65a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65A 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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