Malicious PDF — malware analysis report

Static analysis result for SHA-256 44cf0a997301f4ff…

MALICIOUS

PDF

72.9 KB Created: 2021-02-17 14:53:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 60905554cb42d09dfbfeda3f3b420dd5 SHA-1: aaf28426604ceddbcd8be08d44023f3d5b04e5a5 SHA-256: 44cf0a997301f4ffe1bae6b9363b0bf2100acec6ef41de0bd05ef6c485211429
186 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many hosted on disposable domains, suggesting a link farm or SEO spam campaign. The primary URL found in the document body, 'https://leonvi.ru/wix?keyword=merge+dragons+gem+hack+no+verification', indicates a lure for users searching for game cheats, likely to redirect them to malicious content or phishing pages. ClamAV and ML classifiers also flagged this PDF as malicious, supporting a phishing or scam intent.

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/wix?keyword=merge+dragons+gem+hack+no+verification PDF link annotation
    • https://cdn.sqhk.co/bitaxukezor/cOEeihA/occupational_health_and_safety_technician.pdfIn PDF document text
    • https://cdn.sqhk.co/tizuvuwo/jjLFqH1/toca_hair_salon_2_apk_installieren.pdfIn PDF document text
    • https://rofexigu.weebly.com/uploads/1/3/0/7/130738805/wogaf.pdfIn PDF document text
    • https://wopuvonu.weebly.com/uploads/1/3/1/3/131384791/2215934.pdfIn PDF document text
    • https://fujokexa.weebly.com/uploads/1/3/5/3/135304253/lanuz.pdfIn PDF document text
    • https://bavimukirisami.weebly.com/uploads/1/3/1/4/131482950/zinadepulebaxij-wowazevewidat.pdfIn PDF document text
    • https://cdn.sqhk.co/gixezovof/jojbnjd/78924477073.pdfIn PDF document text
    • https://cdn.sqhk.co/punipopi/Hiahggc/1884676993.pdfIn PDF document text
    • https://vewekazetuxif.weebly.com/uploads/1/3/1/3/131379326/fudolivazixuril-sojanatupeziruv-tafiritodet-sizirozubavupuf.pdfIn PDF document text
    • http://winoorama.website/similar_polygons_worksheet_answer_keyf0suj.pdfIn PDF document text
    • https://cdn.sqhk.co/pajelidul/PgjJjiA/offline_maps_app_download.pdfIn PDF document text
    • https://cdn.sqhk.co/fenazijeguk/Kgcjcl1/ghost_n_goblins_mobile_game_ever.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/tobovunoberiki/bibliografia_normas_apa_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/lowebemuwojiso/kagiwedodelifirivapi.pdfIn PDF document text
    • https://s3.amazonaws.com/regovadeje/zasisu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BF 5532 bytes
SHA-256: d970ea04176dacfb36a9b8f925fe647c23b7dcf562cb2c16e6507644ea3b4068
font_01_sfnt_off0000e873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE873 2116 bytes
SHA-256: 316f78c6e162999e43ccb83d429ef85c46045bf1ac59c77d169faf589ecd4eba
font_02_sfnt_off0000f21d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21D 10540 bytes
SHA-256: 23e7b2f0f712a3f982e0412067e00a17cde27b5a6b5f7fea4257035f92ba44b5

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