Malicious PDF — malware analysis report

Static analysis result for SHA-256 7271ac0bab91ea43…

MALICIOUS

PDF

107.8 KB Created: 2021-05-28 18:10:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 756ee5fde5c70f41cece0e0bb899d75f SHA-1: 2eec20f14701a93fa21c11857d648bac8cd0d223 SHA-256: 7271ac0bab91ea43e3b53eef034d2e00ca9e1a2c1d9ff174520682ca7aa6beca
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting services, and is flagged by ClamAV as a phishing trojan. The document body, though heavily obfuscated, contains text suggesting a lure for 'bollywood movies 2017 free'. The presence of multiple PDF_SEO_LINK_FARM heuristics indicates a link farm strategy, likely to distribute malware or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://kuzutuzo.ru/123?utm_term=khatrimaza+bollywood+movies+2017+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4490752/normal_602d0ffc9bfc6.pdfIn PDF document text
    • https://koxijarekaze.weebly.com/uploads/1/3/5/3/135326688/rurikomefofaponivupu.pdfIn PDF document text
    • https://xafukulirodut.weebly.com/uploads/1/3/1/3/131379356/bb2b6a981766.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413225/normal_60392ad875d7d.pdfIn PDF document text
    • https://funovupudejo.weebly.com/uploads/1/3/4/4/134473131/xatipizeti.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447914/normal_604a4b9a7bf89.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476751/normal_5ffd442ec4f58.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493867/normal_5fcd0bca3d068.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385012/normal_603f321a5f28b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465397/normal_60002ee49688f.pdfIn PDF document text
    • https://tisitijalazog.weebly.com/uploads/1/3/6/0/136017937/boxaluwupan-jowawetemidigu-nenozujobubawu.pdfIn PDF document text
    • https://simiwulizolur.weebly.com/uploads/1/3/1/4/131455232/72119d.pdfIn PDF document text
    • https://tivavazo.weebly.com/uploads/1/3/5/3/135337759/kijabivigejuxakeda.pdfIn PDF document text
    • https://jipafopabos.weebly.com/uploads/1/3/3/9/133986828/zunajegi.pdfIn PDF document text
    • https://tazeviguso.weebly.com/uploads/1/3/4/3/134339516/6721850.pdfIn PDF document text
    • https://satakinufetom.weebly.com/uploads/1/3/5/3/135309339/7958509.pdfIn PDF document text
    • https://denelabi.weebly.com/uploads/1/3/4/1/134109088/a7f9cdece02f9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372702/normal_5febcf151203b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404108/normal_6055b424a0a55.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/3feb672c-eed5-4de8-96ad-84ebff17ff9d/82638769561.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ee31a86-fa1b-4365-b87c-79ac02f292db/48674941733.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000150b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150B8 5964 bytes
SHA-256: 1717a0c603973b33bec6eca1d2d01aa797cae92ee4b9edf72400426f073438dc
font_01_sfnt_off0001650f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1650F 11152 bytes
SHA-256: c183be423fdf5af65f1a24b3fd74236bf0649ce2ce56d6bda861a88e6cf717d7
font_02_sfnt_off00018b4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B4A 16164 bytes
SHA-256: e296a61d2d303e35be9e1a35631556663d2780498efa7e8f3867bf557f172fe6