Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a6031fda7f1e652…

MALICIOUS

PDF

75.0 KB Created: 2021-02-02 19:22:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 3681a3fb5c92e0b859969cf4a75824ee SHA-1: 54ff72d6be81e55969e0321e11aacae74d0a712a SHA-256: 1a6031fda7f1e652fe059f01e28700fe8cb35ad284b73653436bb8865f1df8d7
146 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ClamAV as a phishing trojan. The document body, though heavily obfuscated, contains text suggesting a lure related to 'Whatsapp status new 2019'. The presence of external URIs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://jottigo.ru/aws?utm_term=whatsapp+status++new+2019 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4407100/normal_5ffcefe33c175.pdfIn PDF document text
    • http://wunanufirum.22web.org/palewimemabebifutarilime.pdfIn PDF document text
    • http://mysteps.online/zevavewivutafiworusiymtcm.pdfIn PDF document text
    • http://trixy-matrix.space/numenera_ninth_world_guidebookziua8.pdfIn PDF document text
    • http://stylecurtains.com/restart_by_gordon_korman48em0.pdfIn PDF document text
    • http://nefufovej.22web.org/23571136159.pdfIn PDF document text
    • http://sberpodarok2020.online/377421323320hv6u.pdfIn PDF document text
    • http://hugertely.xyz/66090285066hdwbz.pdfIn PDF document text
    • http://studytogether.fun/brahms_lullaby_sheet_music0n5c9.pdfIn PDF document text
    • http://fresh-ita.fun/nostalgia_ultra_cover_art3si49.pdfIn PDF document text
    • http://salet.store/3194848766kvgxh.pdfIn PDF document text
    • http://dragonflysagewellness.com/film_rocket_man_2019_downloadahmd5.pdfIn PDF document text
    • http://telgrm.site/80597138776tytac.pdfIn PDF document text
    • http://linza.media/the_globalization_of_world_politics_2008sa1jp.pdfIn PDF document text
    • http://kpovli.ru/halloween_party_day_2019_philippinesdhe3d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475992/normal_5fc63a097d000.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387060/normal_6018bee72005c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/tifesizogelevizujofas.pdfIn PDF document text
    • https://s3.amazonaws.com/safago/xasemepibotado.pdfIn PDF document text
    • https://s3.amazonaws.com/pevuwarobuvowa/ielts_reading_sample_with_answers.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_off0000e838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE838 5364 bytes
SHA-256: ced2d869a01516f1636fcf713b61e1030f45a1ca59895741ee0820dba1fce3e3
font_01_sfnt_off0000fa93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA93 10780 bytes
SHA-256: 691207b2291ac4681a6b40d88e27a72dc218af6dd07a578c9f14bee97ce3ef81

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