Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2d3c07cad81593f…

MALICIOUS

PDF

75.4 KB Created: 2021-03-20 15:14:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 5242a913692cdc19ad9940f35d527294 SHA-1: 9eeb9f8434269594b291ade2caf13d08295130d6 SHA-256: a2d3c07cad81593ffb29358181d62fdec57cf44ba65fb02b088186bbbe2c4007
252 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier. It functions as a link farm, directing users to potentially malicious URLs such as 'https://dafemum.ru/wix?keyword=cameron+hydraulic+data+pdf+free+download'. The presence of a 'download button' lure further supports the phishing and malware distribution intent. The ClamAV detection also confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dafemum.ru/wix?keyword=cameron+hydraulic+data+pdf+free+download In PDF document text
    • https://lulofaki.weebly.com/uploads/1/3/1/4/131453598/817fe.pdfIn PDF document text
    • https://pixirexujana.weebly.com/uploads/1/3/4/5/134527097/6903639.pdfIn PDF document text
    • https://bigonukoduxa.weebly.com/uploads/1/3/2/7/132741189/nuwivudoneforal-xidejinu-zibarak.pdfIn PDF document text
    • https://nesibebinirudeb.weebly.com/uploads/1/3/5/3/135311353/181538.pdfIn PDF document text
    • https://gimitowogavu.weebly.com/uploads/1/3/4/7/134746983/a631b.pdfIn PDF document text
    • https://vokedovewugom.weebly.com/uploads/1/3/5/3/135349322/padalemu-tirawamogazuso-mofutobujas-menopukowe.pdfIn PDF document text
    • https://nunibuzobaga.weebly.com/uploads/1/3/0/7/130740367/lademitegij_vinenofir_wulegojomere_bitegixagija.pdfIn PDF document text
    • http://rufowanojona.22web.org/which_roomba_is_best_for_pet_hair.pdfIn PDF document text
    • https://vasejafarobi.weebly.com/uploads/1/3/1/4/131454155/9a79029b7f2085.pdfIn PDF document text
    • https://suwutijotelites.weebly.com/uploads/1/3/6/0/136083726/nagivuxifapu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/28d230d6-0546-41c0-9d84-87df720d1c45/95184999029.pdfIn PDF document text
    • https://569961a5-e6b5-462d-8b38-7193d5e7b20b.filesusr.com/ugd/a37a2e_addedd9c52914644a3d5b2baf50e4231.pdf?index=trueIn PDF document text
    • https://aed022ca-8a9d-452d-9022-56a74a585a14.filesusr.com/ugd/4d548e_80c0f4b5b5314ad69c29e3e33b778dbb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d44bae9e-e9a8-4c2e-ac54-36ff5e5416aa/zotigufetewuxib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecb416b0-3db6-4716-9e5d-25b21b7eb9c6/what_is_wrong_with_the_criminal_justice_system_in_america.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/777f9c61-b9d5-4841-9928-ed87d2062953/nedukililefoxaxizelivoxol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0676e5e-0fff-4bed-8470-5d4c5cbd5e62/kemutapinugiriwakuxojadat.pdfIn PDF document text
    • https://b56e00ce-d729-42e9-814b-b9a4b194f5ba.filesusr.com/ugd/f6f93f_0b1abd2333f94f768549ffdaeb9f57d1.pdf?index=trueIn PDF document text
    • https://17851959-1482-4b49-8222-7b7b0c628459.filesusr.com/ugd/3cb679_1a86448d0361497cb3c231885bc7eb64.pdf?index=trueIn PDF document text
    • http://pumazujawawu.rf.gd/plano_turistico_carcassonne.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97a30142-fda3-435a-9492-04794f842ba0/legotuxugobipoxigesexega.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d49d101-5408-4b6c-b500-6e53e5fde961/fighter_rogue_5e_multiclass.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_off0000e7df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DF 5316 bytes
SHA-256: 2a6ef16766df7bbd6c0c9837fad3d3100a8df0143d3748b54f8c304173878706
font_01_sfnt_off0000f9e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E0 11460 bytes
SHA-256: c6ac5e61e237a3a3e45b738f421a0f468805d2a502124e2d684436aecb2376c1