Malicious PDF — malware analysis report

Static analysis result for SHA-256 15255c87adb8447b…

MALICIOUS

PDF

78.9 KB Created: 2021-02-16 21:58:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 9c4ea17ac94dec45b866a5de00bf40e4 SHA-1: 3fb0115adfdbf8b0443057d8ffc8516c35b64563 SHA-256: 15255c87adb8447b90eb9689da1c9cc1d6134661608620687f0a788143bae15f
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, appears to be a lure to encourage clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/123?utm_term=what%2527s+the+code+for+philips+universal+remote+control In PDF document text
    • https://static.s123-cdn-static.com/uploads/4460055/normal_5fdf9db8b37fc.pdfIn PDF document text
    • http://dmgameplan.com/love_must_be_tough_ebook_free_downloadx9b4k.pdfIn PDF document text
    • http://sungo1.space/vovigojerig6lhos.pdfIn PDF document text
    • http://mikrotikwizard.com/688228866518a0uu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392867/normal_5fdaaa0985974.pdfIn PDF document text
    • http://blockingscenery.com/watch_dogs_2_ps4_save_data51rhr.pdfIn PDF document text
    • https://cdn.sqhk.co/nobixapo/Ujajdhd/87386417314.pdfIn PDF document text
    • http://tersq.fun/afrikaans_taal_worksheetsok51l.pdfIn PDF document text
    • http://kismykeitio.best/darofewisetezofusifi9fl0d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456985/normal_5ffd98c6e8b5b.pdfIn PDF document text
    • http://crubr.space/kufejudamniwi7.pdfIn PDF document text
    • http://usacarins.com/best_fps_multiplayer_games_for_android_2019l0u85.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451044/normal_5ffed3e8d63a4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://robatirewixiwol.rf.gd/gluten_free_pasta_sheets_woolworths.pdfIn PDF document text
    • http://wuzuferopo.epizy.com/43123371821.pdfIn PDF document text
    • https://s3.amazonaws.com/bezutu/agisoft_photoscan_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/dowesitobuga/9380628460.pdfIn PDF document text
    • http://bijamujijupife.epizy.com/estimating_square_root_worksheet_8th_grade.pdfIn PDF document text
    • http://kujujigufa.epizy.com/11275543467.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_off0000f6dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DD 5504 bytes
SHA-256: 741dd71320d0409865265226e2003b808e6d8615621d9757c48eb0546a656646
font_01_sfnt_off00010983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10983 10716 bytes
SHA-256: 250cd75d82a73fe9b1b08ae3723a24049886973785db9dbb7b7205ded19bc943

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