Malicious PDF — malware analysis report

Static analysis result for SHA-256 31ec84f3fc878658…

MALICIOUS

PDF

82.0 KB Created: 2021-05-30 00:22:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 2fa75e51caaf2c530f6c39a290741c73 SHA-1: 45911e90b3b63241f8582fea5aed49508d25cf9a SHA-256: 31ec84f3fc8786584e198600c705f90da84c14efbe3f1d3532eebec73e925fc1
194 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The presence of a large number of external links, many hosted on disposable domains, suggests a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, contains a URL that likely serves as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://maypoin.ru/123?utm_term=album+bts+answer+tracklist PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4476147/normal_605c3cae4cde5.pdfIn PDF document text
    • https://bejejedagaf.weebly.com/uploads/1/3/4/8/134862385/6688897.pdfIn PDF document text
    • https://rixilokif.weebly.com/uploads/1/3/4/1/134109141/gonofov.pdfIn PDF document text
    • https://polemezal.weebly.com/uploads/1/3/1/4/131452876/6845848.pdfIn PDF document text
    • https://gosaronazaniga.weebly.com/uploads/1/3/4/8/134851605/bubuwonit.pdfIn PDF document text
    • https://wabumixa.weebly.com/uploads/1/3/4/5/134585451/3960530.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378405/normal_602bd9015f4a9.pdfIn PDF document text
    • https://kepofubegitonez.weebly.com/uploads/1/3/5/3/135306487/rofun-nifogukusa-kovakediwud-wokawosezitudut.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485152/normal_5ff531ecef3ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501201/normal_6036f4c32ada2.pdfIn PDF document text
    • https://xupubiwe.weebly.com/uploads/1/3/4/3/134339906/lejad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369491/normal_606a13a62be53.pdfIn PDF document text
    • https://dunebuka.weebly.com/uploads/1/3/2/6/132682868/34994e96.pdfIn PDF document text
    • https://soxoxalumowaju.weebly.com/uploads/1/3/4/7/134768556/6295236.pdfIn PDF document text
    • https://nekemefewebewon.weebly.com/uploads/1/3/7/5/137504470/22a1f9611f2464.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493227/normal_600b18911eac7.pdfIn PDF document text
    • https://jadufebifov.weebly.com/uploads/1/3/4/6/134627690/9905957.pdfIn PDF document text
    • https://judurufag.weebly.com/uploads/1/3/4/6/134688768/b5cd3c35e7128.pdfIn PDF document text
    • https://fowifosefudewak.weebly.com/uploads/1/3/4/6/134699900/reviwif-pofefuzatabi.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
    • https://uploads.strikinglycdn.com/files/56c6dd1b-5c88-454a-a37e-a3192645538f/how_much_for_adobe_premiere_pro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09d7850e-bbd6-40af-ac0c-323a63589861/brother_project_runway_limited_edition_ce1125prw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8ca14e3-f929-49bf-ab45-da6b662016f2/pupupivukutulezugaju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00a6a9a4-ad8a-433b-a34a-0099775dfb4d/how_does_the_polaris_backup_valve_work.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f8725a4-673d-4423-8b38-33c5a9ec5953/50632695459.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_off0000f5aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AA 5000 bytes
SHA-256: 678b46cc12dc7e57deef82ea4117e2de3712b5a484bfcb085f88e3362351427a
font_01_sfnt_off0001069b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069B 10508 bytes
SHA-256: 8aa2fb3b307ce3788a73cc33c5c4ad18ab5377c835f219063a2b0720fcf18865
font_02_sfnt_off00012aa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA1 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176