Malicious PDF — malware analysis report

Static analysis result for SHA-256 c157339e34951aae…

MALICIOUS

PDF

71.8 KB Created: 2021-03-22 07:21:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c9fb2a068062a5feb3dcfc1720bdc4f6 SHA-1: 9feb955247152534071b9df9aa4c889352b6697f SHA-256: c157339e34951aaedc091100205a82ab075e6e442c0169a8ca14aa46574b08d6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://seumenha.ru/wix?keyword=ni+no+kuni+guide+book PDF link annotation
    • http://astrology-personal.online/area_and_perimeter_ks2_worksheetsq7hh4.pdfIn PDF document text
    • http://moneymaya.site/sewejezunopiw8hjs9.pdfIn PDF document text
    • http://rollernefritmassage.xyz/99733100603wvpxh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462708/normal_5ffc8218ec5a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491925/normal_6023d4005b97c.pdfIn PDF document text
    • http://italy50wow.pro/dunitulomekabimuq4iz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366324/normal_6023da821f140.pdfIn PDF document text
    • http://mevukavotidu.getenjoyment.net/56967744433.pdfIn PDF document text
    • http://zogometemo.sportsontheweb.net/weak_acid_and_weak_base_titration.pdfIn PDF document text
    • http://parkji5x.xyz/self_respect_worksheetfi8ax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445104/normal_60146aceab70a.pdfIn PDF document text
    • http://webdefilmizle.com/xumoxokugezujadf6lo.pdfIn PDF document text
    • http://fazejajogavu.medianewsonline.com/best_pll_algorithms.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379849/normal_5feec7bff1766.pdfIn PDF document text
    • http://tulomodev.getenjoyment.net/ronanufudunajositimi.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
    • http://lewinozed.atwebpages.com/algorithme_avanc_et_complexit.pdfIn PDF document text
    • http://kageditivumimor.onlinewebshop.net/convert_to_word_without_acrobat.pdfIn PDF document text
    • http://xezaretidatoro.onlinewebshop.net/adobe_reader_apk_for_windows_8.pdfIn PDF document text
    • http://durenifujogax.myartsonline.com/37313969288.pdfIn PDF document text
    • http://vujapoguxesak.myartsonline.com/arjuna_award_2020_winner_list.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_off0000d1a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A1 4452 bytes
SHA-256: 15119aa1c792b97429fe0e634803f0691dcff549d9571ee7f12ddedefd53cd7d
font_01_sfnt_off0000e0cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CD 10244 bytes
SHA-256: de5e25cf0dee458336cafb69247c42096e6eabcef41841713e80ef67f3c71881
font_02_sfnt_off000103b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B8 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c