Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aefe9f5f4dd9578…

MALICIOUS

PDF

77.0 KB Created: 2021-05-15 03:07:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: b193d7843661371ae3eade10cf227b93 SHA-1: b99909be7b52f1bf5426b0dbaf8d4237a96eb791 SHA-256: 8aefe9f5f4dd9578d47413f255c08a6ce098c921a1536a23b994577dde719f15
186 Risk Score

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 0.9995

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://golowaki.ru/strik?utm_term=famous+jane+jacobs+quotes PDF link annotation
    • https://welarozukakiwa.weebly.com/uploads/1/3/4/4/134497755/lofode.pdfIn PDF document text
    • https://sofamilases.weebly.com/uploads/1/3/5/4/135401016/motovusup-juxizelipexinim-numudanu.pdfIn PDF document text
    • https://gakewejodum.weebly.com/uploads/1/3/4/9/134902465/ea853a670.pdfIn PDF document text
    • http://larekew.mywebcommunity.org/77626650388.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477386/normal_606c1e4b4c736.pdfIn PDF document text
    • https://cdn.sqhk.co/vakiduju/42jhXjh/tuwexidotigilozawatek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374835/normal_60430a4c3ab86.pdfIn PDF document text
    • https://fetepidema.weebly.com/uploads/1/3/4/6/134684810/warevakum-dawafasaxobe-jopetufebaki-mogegejasumezi.pdfIn PDF document text
    • https://cdn.sqhk.co/mogidamiko/yiibhiJ/happier_ed_sheeran_fingerstyle_tabs.pdfIn PDF document text
    • https://kifowufowuvix.weebly.com/uploads/1/3/5/3/135392599/3e085510c65273e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423757/normal_6065304e14744.pdfIn PDF document text
    • https://cdn.sqhk.co/wularumijif/LicAKhd/john_lewis_brushed_cotton_bed_sheets.pdfIn PDF document text
    • https://cdn.sqhk.co/supetuzitepi/hbjhyjd/21686247827.pdfIn PDF document text
    • https://cdn.sqhk.co/risubibasero/8Xhbjeq/latest_bollywood_songs_free_download_320kbps.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425924/normal_5fccdef753237.pdfIn PDF document text
    • https://movediwifed.weebly.com/uploads/1/3/2/6/132695881/lezafefut.pdfIn PDF document text
    • https://cdn.sqhk.co/ponibokilil/BJjiUAT/computer_service_bill_format.pdfIn PDF document text
    • https://cdn.sqhk.co/wakivugex/f1N7gi0/objective_of_ifrs_advisory_council.pdfIn PDF document text
    • http://tadajixilatu.scienceontheweb.net/noxesutelowemir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468820/normal_606e7e2dc9efc.pdfIn PDF document text
    • https://jamojibo.weebly.com/uploads/1/3/5/3/135349767/todoxasafuxe-zijilewonugilit-vufel.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://nizofikunatafu.atwebpages.com/kandungan_ampas_tahu_dan_kegunaannya.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_off0000e378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE378 4948 bytes
SHA-256: 25d6cbe3038207515cea6cc46cdeb30cd755271c2b338a39018ca596a13daac4
font_01_sfnt_off0000f446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF446 10732 bytes
SHA-256: 4fe0274308e59576060e817e61df3e149dc8e8b2a8492ba390e9df2e0c3d4a07
font_02_sfnt_off000118a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A9 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2