Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec77cf210062e3a4…

MALICIOUS

PDF

109.1 KB Created: 2021-02-19 01:14:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 5c1f4274d2800e6d820f63cc23c722c2 SHA-1: a73f9d2c78521d72c27ff125e414c26c3c174cb7 SHA-256: ec77cf210062e3a4559220491c990367e9360846a58ba65813d89844f823cbe8
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with many pointing to disposable hosting services. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or SEO spam. Although no scripts were explicitly extracted, the PDF structure and numerous URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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/strik?utm_term=stock+market+open+on+thanksgiving PDF link annotation
    • https://lavolobaned.weebly.com/uploads/1/3/0/7/130740571/165242.pdfIn PDF document text
    • https://fumitalabojaluk.weebly.com/uploads/1/3/5/3/135399187/7b1c8a020aa40.pdfIn PDF document text
    • https://raxorevowipafe.weebly.com/uploads/1/3/4/7/134765671/f5b89386e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426676/normal_6005c2e079efe.pdfIn PDF document text
    • https://koxabiwepa.weebly.com/uploads/1/3/4/3/134309970/9cb6a787.pdfIn PDF document text
    • https://zalozudipob.weebly.com/uploads/1/3/4/6/134673455/c539740df2b7f.pdfIn PDF document text
    • https://gamevuwi.weebly.com/uploads/1/3/4/5/134525912/kujisabidanosif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380403/normal_5fda552fc650f.pdfIn PDF document text
    • https://dirasikazeta.weebly.com/uploads/1/3/1/3/131379856/1712807.pdfIn PDF document text
    • https://cdn.sqhk.co/lewonuvaxu/ijeXlia/underhand_cable_pulldown_muscles_worked.pdfIn PDF document text
    • https://waferipesor.weebly.com/uploads/1/3/5/3/135307907/xosasovojeg.pdfIn PDF document text
    • https://cdn.sqhk.co/kinubowa/ngcngdH/ted_lasso_trailer_deutsch.pdfIn PDF document text
    • https://pesasujax.weebly.com/uploads/1/3/4/8/134882000/339f220fa5c.pdfIn PDF document text
    • https://cdn.sqhk.co/dogilijesiwu/cciS9ha/nobitaz.pdfIn PDF document text
    • https://toraboretopupu.weebly.com/uploads/1/3/4/7/134769369/3596e1dc7f.pdfIn PDF document text
    • https://migixemigesafo.weebly.com/uploads/1/3/1/3/131381985/9373109.pdfIn PDF document text
    • https://cdn.sqhk.co/sujubowip/ij8jcSQ/ngk_movie_ringtone_songs_telugu.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_off00016afb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AFB 5544 bytes
SHA-256: f39002b52f85a5c85440c09b99d7555ccc45a777f9cd1280260ca8385ef0b672
font_01_sfnt_off00017db4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17DB4 12640 bytes
SHA-256: 92182e3d050ed6d2d5d1b36e917b10fde0e3f916fefc5041c2ff975e71ae47d0

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