Malicious PDF — malware analysis report

Static analysis result for SHA-256 72a11e0b9d875fac…

MALICIOUS

PDF

108.4 KB Created: 2021-06-07 11:12:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: c81b2fffe864d4f161f614a1d6b0206d SHA-1: 04e434dbff4b29c11e9218a7508cd6d1b76fad63 SHA-256: 72a11e0b9d875fac2a3d4877e20bcf4483707bf1919e73e66374b7960ed13516
186 Risk Score

Malware Insights

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

The PDF file contains numerous embedded external links, many pointing to disposable hosting, and a primary URL that appears to be a redirector. This behavior is indicative of a link farm or phishing campaign designed to drive traffic to malicious sites. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://queure.ru/pbw?utm_term=aayirathil+oruvan+karthik+full+movie+tamil+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4383156/normal_5fcca95cab21f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420432/normal_60147f213a6f0.pdfIn PDF document text
    • https://dilozerekake.weebly.com/uploads/1/3/1/4/131452754/sipiligof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375361/normal_603c18d41403a.pdfIn PDF document text
    • https://toripifisesu.weebly.com/uploads/1/3/4/3/134367164/belozowi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484995/normal_606e68f1af239.pdfIn PDF document text
    • https://sidujojuwizubal.weebly.com/uploads/1/3/4/5/134587716/3319428.pdfIn PDF document text
    • https://wivusogonelom.weebly.com/uploads/1/3/5/3/135310870/90471.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374178/normal_6050bc7b70906.pdfIn PDF document text
    • https://rujedupexiveviz.weebly.com/uploads/1/3/4/8/134874221/kogusadomubumet-winadakexu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409403/normal_6024a8dfd6aad.pdfIn PDF document text
    • https://kazirevuteguzug.weebly.com/uploads/1/3/2/6/132681824/8b97bbb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482870/normal_60072e16d2e5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383160/normal_603f7eeed6d4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461748/normal_5fdb74d80e0f2.pdfIn PDF document text
    • https://miluxeto.weebly.com/uploads/1/3/5/3/135326788/gifut_womeguzezimexob_tamedi.pdfIn PDF document text
    • https://zigeginuserepu.weebly.com/uploads/1/3/4/0/134041232/rafevagixawixez_siluv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4394066/normal_5ff9dc6533090.pdfIn PDF document text
    • https://tiketutowiko.weebly.com/uploads/1/3/5/3/135345961/393df3fb8b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385230/normal_603cb7c2d8ed9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/36c30777-41f7-4230-aae7-fb281784feaf/age_of_rebellion_cast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80a50fbf-a567-4f12-8a93-21ab2897e9ef/4785604147.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d827a5d-ffbf-4211-944b-5c015e40c773/toque_de_bandera_para_preescolar_letra.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff59e138-8a95-4cc4-a181-97f2437517b6/dream_interpretation_feeding_baby_elephant.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013a6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A6C 5276 bytes
SHA-256: 79ea27c34728eb4f6f8efcd4b9ef62cd8a743b4539d6ccefb30d85bf8b6d84f6
font_01_sfnt_off00014c4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C4C 8604 bytes
SHA-256: 56398d532bc11cafd21ce0230a413df939504138d1975a361aa1e8a21450aac1
font_02_sfnt_off000164d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164D5 11976 bytes
SHA-256: 705e8ac2d60a1e8a6a2ce75f330290a5460991ba00a7450bc69ca2c06f810c1c
font_03_sfnt_off00018d66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D66 16164 bytes
SHA-256: e296a61d2d303e35be9e1a35631556663d2780498efa7e8f3867bf557f172fe6

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