Malicious PDF — malware analysis report

Static analysis result for SHA-256 b27c2a830a9d914a…

MALICIOUS

PDF

74.1 KB Created: 2021-03-12 13:46:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ed9ade796a70fc657fdda448f7dac03a SHA-1: b9a9ac6a247964a7c1a20d7de5373129544f9a0b SHA-256: b27c2a830a9d914a5e80a21347bb1758991b4da11063fb3d50cc02070f8d9bc0
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to potentially harmful sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination or distribute phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xajibur.ru/award?keyword=phonetic+alphabet+printable+pdf PDF link annotation
    • http://nudoravodu.22web.org/gixixufujiwomez.pdfIn PDF document text
    • http://particuliers-societegenerale.xyz/51120035297si0r7.pdfIn PDF document text
    • http://fabulouss.space/tomaso_albinoni_-_adagio_in_g_minor53a4b.pdfIn PDF document text
    • http://zomotumat.iblogger.org/singer_merritt_4530_bobbin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418746/normal_6041ac10570c2.pdfIn PDF document text
    • https://cdn.sqhk.co/baxoladipezu/ggQihdl/best_earplugs_to_block_out_traffic_noise.pdfIn PDF document text
    • https://cdn.sqhk.co/vaxarogajib/jcUgg9g/mutobowekonawowinuba.pdfIn PDF document text
    • https://wexotagupoma.weebly.com/uploads/1/3/2/8/132814474/fe1bf5b.pdfIn PDF document text
    • http://cucoupon.info/surijuriroludojejezs7nh1.pdfIn PDF document text
    • https://cdn.sqhk.co/lixipadiwel/siguifs/best_deals_on_apple_watch_series_3.pdfIn PDF document text
    • https://cdn.sqhk.co/jutafegobexe/T2W5icN/doot_meaning_in_sanskrit_of_english_words.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374379/normal_5fc72d9d39ef7.pdfIn PDF document text
    • https://puxofigu.weebly.com/uploads/1/3/5/3/135347112/2446793.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371787/normal_601bb0b4e73d8.pdfIn PDF document text
    • http://udilische.club/851189350016wgbw.pdfIn PDF document text
    • http://about-central.com/jazizukodewu05slu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8d684a1e-4078-49cd-b336-05adf09473b6.filesusr.com/ugd/2b25e8_5d0485451b02427aa38f4a6e2c723eb3.pdf?index=trueIn PDF document text
    • https://cee4a208-09ac-40e0-983f-4c2cc776acbe.filesusr.com/ugd/5ed537_b6096978c1604f239487dc01dc3a2d10.pdf?index=trueIn PDF document text
    • https://9e1b5e4e-b4ab-405b-8fdf-b3b6d7b19c28.filesusr.com/ugd/94ea38_4c0e5eda048242eeb0b615741f4bf921.pdf?index=trueIn PDF document text
    • http://dapizifotokom.epizy.com/lobozuwedalebuz.pdfIn PDF document text
    • https://1cdd1dcb-54a5-4750-95ad-c4cce9a68cd1.filesusr.com/ugd/1e32c2_da58c9ccaab943279b7697041888256c.pdf?index=trueIn PDF document text
    • https://a161ff94-1a6f-4367-b6f8-8e513a5e676d.filesusr.com/ugd/4c7633_fb0c242438c849ac91fdd9d9215af81a.pdf?index=trueIn 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_off0000e5fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FD 5204 bytes
SHA-256: c25d4bdb5739785a20acd9d0a54338e97a18577a8f0bc72e48eec80e947046b3
font_01_sfnt_off0000f7a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A0 10348 bytes
SHA-256: 065c59b86ba42bd792c5177a013d94716173dcee3c12a23ee324a4ddaff106f8

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