Malicious PDF — malware analysis report

Static analysis result for SHA-256 80e315a3011b568b…

MALICIOUS

PDF

75.5 KB Created: 2021-03-17 17:24:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: c07a44fba8d1ac9ade6510b0b568a2f2 SHA-1: 31621f990467ea9acff9dc93859ccdfd77ed2ddc SHA-256: 80e315a3011b568b0427176ed8d6994ebc872133208c53bb2eb5691ead716051
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body, though heavily obfuscated, contains keywords related to academic calendars, suggesting a lure to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jumiwimov.ru/wix?keyword=university+of+minnesota+morris+academic+calendar+2020-21 PDF link annotation
    • http://helpcenterbusiness.xyz/nulikefesowadadebzhpgj.pdfIn PDF document text
    • http://silvanozito.online/likosu5pbz7.pdfIn PDF document text
    • http://tumuduwaju.mypressonline.com/financial_aid_appeal_letter_sample.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499329/normal_60046fb4b086b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421640/normal_5fda72f444588.pdfIn PDF document text
    • http://makebugobiwuka.mypressonline.com/vovubuvozi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417662/normal_603438c547aae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470380/normal_60011b64e25b2.pdfIn PDF document text
    • http://tvoeobrazovanie.fun/10456696326ea7pj.pdfIn PDF document text
    • https://jabuzowe.weebly.com/uploads/1/3/4/3/134312688/2388537.pdfIn PDF document text
    • http://vuzopozakobepe.22web.org/55811048156.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379489/normal_5fcf198bda45a.pdfIn PDF document text
    • https://kidodizaramaba.weebly.com/uploads/1/3/4/0/134096495/e08df.pdfIn PDF document text
    • http://sowipilarow.mygamesonline.org/challenges_facing_agriculture_in_africa.pdfIn PDF document text
    • https://nonibebufixaz.weebly.com/uploads/1/3/2/6/132682934/xafasikobiwuf_rurujapej_sizujiwur_subelakejata.pdfIn PDF document text
    • http://erethiztzj.space/714275594177wiix.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://toxerisana.epizy.com/bhoot_fm_6_april_2018.pdfIn PDF document text
    • http://pesetunal.onlinewebshop.net/luka_lecet_adalah.pdfIn PDF document text
    • http://gofemotomikuroj.epizy.com/5_branches_of_agriculture.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AD 5680 bytes
SHA-256: 25d1b04598bf8bc0ef002c5c5d92ec6a2aa8ee2fa1ea729303e9832a439d496a
font_01_sfnt_off0000f800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF800 11276 bytes
SHA-256: 0e9865e31b9e41befe96a31bd61e376f2f95445e24f2290b57f987747f71bd26

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