Malicious PDF — malware analysis report

Static analysis result for SHA-256 0157ec848327c4df…

MALICIOUS

PDF

73.0 KB Created: 2021-04-29 01:02:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: d02c6765c521b7ac76dd4ba40985e8a5 SHA-1: 13e90dfeda40446c3b78dc01bc00f3aa7912145f SHA-256: 0157ec848327c4df733b2e5ff91fba10ca2531c62c3d85c8ab728c38f36c9c33
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF document that contains numerous embedded URLs, many of which point to disposable hosting services and are used in a link farm pattern. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, appears to be a lure related to calculator usage, aiming to trick users into clicking 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://xezojetit.ru/strik?utm_term=how+to+do+standard+deviation+on+casio+fx-115es+plus PDF link annotation
    • https://cdn.sqhk.co/poxufape/LXw8hfX/35781395087.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466172/normal_5fee73726b527.pdfIn PDF document text
    • https://cdn.sqhk.co/jusulikipe/6jggd7E/95207478904.pdfIn PDF document text
    • https://cdn.sqhk.co/lixijadimit/hciiicT/85367469994.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403131/normal_5fd9d7656ed54.pdfIn PDF document text
    • https://zewobukepefew.weebly.com/uploads/1/3/4/4/134485556/9511122.pdfIn PDF document text
    • http://borejukeluteva.mygamesonline.org/schaum_outline_series_signals_and_systems.pdfIn PDF document text
    • https://rixatesar.weebly.com/uploads/1/3/1/8/131871899/9132627.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370090/normal_600f549abb09b.pdfIn PDF document text
    • https://babotiditufo.weebly.com/uploads/1/3/4/6/134694550/5028450.pdfIn PDF document text
    • https://cdn.sqhk.co/kibukumivu/pUSp4gn/hayward_10_day_weather_report.pdfIn PDF document text
    • https://ruxabetuju.weebly.com/uploads/1/3/2/7/132740595/4034379.pdfIn PDF document text
    • https://wigikeketiru.weebly.com/uploads/1/3/1/4/131406435/9eb29f8f004e3c1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tunawibiga.rf.gd/87119158349.pdfIn PDF document text
    • http://jefefudutumoki.epizy.com/34414710710.pdfIn PDF document text
    • https://s3.amazonaws.com/juzowilipi/bufakikogadeleliwi.pdfIn PDF document text
    • https://s3.amazonaws.com/nilafafakem/5196848718.pdfIn PDF document text
    • http://wumepudefix.rf.gd/kuvabalil.pdfIn PDF document text
    • http://kutoxinupuroxo.onlinewebshop.net/5865499368.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e11a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11A 5540 bytes
SHA-256: d131593c816a35b42215e16c07bbb2b5cbb39b79c23f48088df5556a28cd7882
font_01_sfnt_off0000f42e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42E 9904 bytes
SHA-256: b5427f74e1cd00d36d22208874f9be4d4c9238795a08f168f95a4593d9bfa03e

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