Malicious PDF — malware analysis report

Static analysis result for SHA-256 9aa4921ce9bcc3b6…

MALICIOUS

PDF

69.5 KB Created: 2021-03-31 00:41:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 77867758a50d59e321a4377cb160a652 SHA-1: fa3213950c5c91ca0a44dab2f99c3b1b2114e8b7 SHA-256: 9aa4921ce9bcc3b6dc6d46203d2a5271a5cd1e57f0f512ea95191305353a30dc
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting it functions as a link farm, potentially for SEO manipulation or to distribute further malicious content. The presence of external URIs and a link farm heuristic points towards an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/award?keyword=libro+raven+botanica+pdf PDF link annotation
    • https://rinadulig.weebly.com/uploads/1/3/0/7/130739308/naverojebo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495050/normal_5feeecbf7dc16.pdfIn PDF document text
    • http://getsalle.xyz/the_lottery_book_moviel9yjv.pdfIn PDF document text
    • https://zidevikab.weebly.com/uploads/1/3/4/5/134576262/ff0625431.pdfIn PDF document text
    • http://autobaff.xyz/toxizonabebiboluregxj7fq.pdfIn PDF document text
    • http://familyit.info/superdry_ladies_jacket_size_guidep3dwx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454559/normal_604da481b0856.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383149/normal_5fd3334597c9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415537/normal_60272ebc2046b.pdfIn PDF document text
    • https://timodidub.weebly.com/uploads/1/3/1/3/131379596/zipukejul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475571/normal_605eea5f2ff91.pdfIn PDF document text
    • https://genofegewad.weebly.com/uploads/1/3/0/7/130776157/rakeromuridu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e824aeac-d22a-4b45-bb3c-17051d6ee04f.filesusr.com/ugd/de60da_c0631a15b0b147499e2ffe25e7841fac.pdf?index=trueIn PDF document text
    • https://b304dada-1952-41b2-af44-d16a3232bb3f.filesusr.com/ugd/c19c34_81a2995a30a8483c9de734cf12744f65.pdf?index=trueIn PDF document text
    • https://44879a12-c10a-431c-a98a-7de142752d0f.filesusr.com/ugd/bb4607_718666c944304f1c8563c06f3098a952.pdf?index=trueIn PDF document text
    • https://42cc6f6d-9125-48bc-bce4-1bf15f49b1be.filesusr.com/ugd/7c30af_1f6bed5cce28421a84c02340761b3655.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tosevud/husky_power_washer_wand_stuck.pdfIn PDF document text
    • https://488c2ff9-9ff4-499e-8f11-525115e20b22.filesusr.com/ugd/8aba0c_3cf2a73a3af04cecb793f8f1467428c7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zumezeviwakiz/xuvexiris.pdfIn PDF document text
    • https://1b6fe947-be7e-4494-9a94-f566f178d3d1.filesusr.com/ugd/89064d_7930663888d2453b90112d5a939f2e8a.pdf?index=trueIn PDF document text
    • https://2a983b51-2e13-4971-8c1f-a5bca3ab4353.filesusr.com/ugd/e1a791_48a4b0b0fa2d48bb91d0d1ecec51d0eb.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_off0000d080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD080 5080 bytes
SHA-256: 349ecc06862792c48d6c075f19610e4bc579acbd1fb6af7fb1f8856a9de18ca9
font_01_sfnt_off0000e1e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E1 11672 bytes
SHA-256: f5813576e890d283fc866811d6cf339d73c07d831c930852982af6722877a76a