Malicious PDF — malware analysis report

Static analysis result for SHA-256 98af7d9d62ba9d56…

MALICIOUS

PDF

75.0 KB Created: 2021-04-08 01:45:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: f82a796eaf0c21cc700b42e5bfb02022 SHA-1: 28e10c3d81227c2521d55892689428caafc4fd23 SHA-256: 98af7d9d62ba9d5628a5c547fb0f6956b43fc93feac8d429ce9ff69860b45a12
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on disposable domains or use UTM parameters, indicating a link farm or SEO spam campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/strik?utm_term=on+the+road+again+movie+with+willie+nelson PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420019/normal_606e28fd25d08.pdfIn PDF document text
    • http://clientbluebadge.com/six_sigma_control_chart_excel_templatesm7k8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485946/normal_605c642026dd2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465924/normal_601d05a421be5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485930/normal_600240e72c7f2.pdfIn PDF document text
    • http://qqkaxes.xyz/sejizoluzikawufebiwepefojrumhr.pdfIn PDF document text
    • https://litufefanim.weebly.com/uploads/1/3/4/9/134901191/84a3a771d36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489844/normal_601a1ee5eef60.pdfIn PDF document text
    • http://lovelyhouse.online/puwaruridepaxe3c99c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418755/normal_6032e78154499.pdfIn PDF document text
    • http://wiinorama.space/how_to_replace_neff_oven_light_bulbr2x22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411252/normal_5fdbd543ae5f5.pdfIn PDF document text
    • http://effektzhizni.ru/65434923535pezip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480756/normal_6046b894eaeb4.pdfIn PDF document text
    • https://xovonugobo.weebly.com/uploads/1/3/4/6/134688771/4ff2ae29f.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/zijivevip/decision_tree_regression_explained.pdfIn PDF document text
    • https://s3.amazonaws.com/fojaxexino/bricks_breaker_puzzle_apk_indir.pdfIn PDF document text
    • https://23751d96-d7b3-42ca-b8ca-e459b671ea95.filesusr.com/ugd/7de994_777eb0462c124e8a84be31552e029c64.pdf?index=trueIn PDF document text
    • https://050a9d39-d8a1-4107-8be8-b2b70b72e454.filesusr.com/ugd/5262df_77d1655f886442328e03545a86c3180e.pdf?index=trueIn PDF document text
    • https://e055bcc9-c4f1-4c6c-8dcb-0912bf54750f.filesusr.com/ugd/b4a829_d618405f805d4161948a6105663e50d4.pdf?index=trueIn 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_off0000e6ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AD 5420 bytes
SHA-256: 438af388913cad559e548246d08e7d32c5f8f135c2f61f90ba3e0d007cfcacac
font_01_sfnt_off0000f8fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FE 11664 bytes
SHA-256: fd90622b5c4e9ec621509e7e6798a22226794a549cb33ebb2e286b3a1026e96f