Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7c9135fe12527bc…

MALICIOUS

PDF

69.6 KB Created: 2021-03-10 07:49:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: acbaac4f2225bed7ee2a7b9c09a400b8 SHA-1: d761d6669da0cc31bff1574b903492d8163c87fa SHA-256: f7c9135fe12527bc02b9374a0ab50610e1332982767673fd6168438435593608
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 by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains and link farms, indicating a likely attempt to redirect users to malicious sites. The document body, though heavily obfuscated, suggests a lure related to 'books' or 'pdf' files, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/award?keyword=averroes+libros+pdf PDF link annotation
    • https://cdn.sqhk.co/xoxifopu/jfq5uif/kolirulusokamep.pdfIn PDF document text
    • https://cdn.sqhk.co/mevutaxisut/uhijcyS/3d_pinball_game_download_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/merutigujet/ifDhjhf/zapesaveguzosimelekib.pdfIn PDF document text
    • https://rogujodur.weebly.com/uploads/1/3/4/8/134899240/mazeke.pdfIn PDF document text
    • https://nolulanulupu.weebly.com/uploads/1/3/1/3/131379612/5514603.pdfIn PDF document text
    • http://9gusevshop.website/difference_between_tascam_dr-40_and_dr-40xvvtsx.pdfIn PDF document text
    • http://reactivascotia2020.com/35233124997waycb.pdfIn PDF document text
    • https://cdn.sqhk.co/tumowara/6HjMbNg/negijefenajap.pdfIn PDF document text
    • http://idealica-ordina.site/twilight_books_in_order8lc37.pdfIn PDF document text
    • http://sollabs.xyz/599871575385iysn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469850/normal_6025fa201da7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407062/normal_60384454b6665.pdfIn PDF document text
    • http://mixed-rootwork.com/91928876218a5eg8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463565/normal_604819a88e5d7.pdfIn PDF document text
    • http://table-wait.com/mejibebebodh470.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413111/normal_5ffa8e41b7489.pdfIn PDF document text
    • http://mamajan.space/luzor7kzz5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f2d630f-8b5d-4614-8a75-deba2c5cb19f/think_deeply_meaning_in_urdu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf205411-365d-42c7-a323-46d56e2f3d9b/do_carmo_differential_geometry.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8ad8d57-6c64-47f4-95ab-c9f28baed7a0/english_speaking_sentences_in_daily_life.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e07cc157-943d-4aea-86ed-38fd447c22a1/telodetederodunafotin.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_off0000d500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD500 5016 bytes
SHA-256: 8158c2f5c5401e600d3706ba7152db9b42784046266fd3ed814d1579eb886165
font_01_sfnt_off0000e620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE620 10812 bytes
SHA-256: 74cf25ae92e19664e72983c8aa29aaa7d9e39c55356be870175db99693f7b1c2

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