Malicious PDF — malware analysis report

Static analysis result for SHA-256 597caa1fd8c7145a…

MALICIOUS

PDF

72.1 KB Created: 2021-02-23 04:45:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5c2389267825f0eb8adbbe758389321d SHA-1: 86392877b44bb76d9bbb55db8a32311d56d334d4 SHA-256: 597caa1fd8c7145a42c71b08c7a2f72cc7cecefcff9693bc751f7881a1013e75
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://leonvi.ru/123?utm_term=chapter+2+the+chemistry+of+life+vocabulary+review+crossword+puzzle+answers PDF link annotation
    • https://cdn.sqhk.co/xokebuzizo/pzjbfHd/u_are_my_starship_lyrics.pdfIn PDF document text
    • https://juporolo.weebly.com/uploads/1/3/1/3/131380745/wuxubax-zenujugido.pdfIn PDF document text
    • https://furimulu.weebly.com/uploads/1/3/1/4/131411024/jupudorixi.pdfIn PDF document text
    • https://cdn.sqhk.co/sojetaji/agcgcKB/wotujinonagewumalazoli.pdfIn PDF document text
    • https://basedupapopulow.weebly.com/uploads/1/3/4/3/134344364/mudidedejab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366653/normal_5fd1444a410f5.pdfIn PDF document text
    • https://wanusasa.weebly.com/uploads/1/3/1/0/131070791/xaline.pdfIn PDF document text
    • https://pidesetax.weebly.com/uploads/1/3/0/7/130739971/guwozofemoj_zazesunimimul.pdfIn PDF document text
    • https://cdn.sqhk.co/xewafazuk/CjhRkJ1/duvunolazanijovezepozuw.pdfIn PDF document text
    • http://verification-help.business/dj_booth_for_sale_ebayfsjo8.pdfIn PDF document text
    • http://raisinslabs.club/79552717307jnhyf.pdfIn PDF document text
    • https://nakilogizo.weebly.com/uploads/1/3/4/3/134363069/75323ec975b.pdfIn PDF document text
    • http://reestr.site/58543181154jjfdb.pdfIn PDF document text
    • https://jedopebo.weebly.com/uploads/1/3/4/8/134889916/vatowamesakajak.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408001/normal_5fecd36085c87.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379744/normal_5ff782e5d8540.pdfIn PDF document text
    • https://cdn.sqhk.co/metexemoraga/gcwWMjc/ocean_warriors_chasing_the_thunder_watch_online.pdfIn PDF document text
    • https://wowererifawop.weebly.com/uploads/1/3/1/3/131384429/lusukepupa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000da83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA83 5876 bytes
SHA-256: 6ef33587e972b4d7c4a78030bd4b54366292a5ba5d87952613ae05ba6225cd63
font_01_sfnt_off0000ee77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE77 10596 bytes
SHA-256: bffadf67e8b7462052bfd45049963830f7d91fedfada9e774bfbe06571d4e2bf

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