Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8eb43e145f6b24a…

MALICIOUS

PDF

84.8 KB Created: 2021-01-26 21:55:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 653422ab9a75b00586af48e73834082e SHA-1: 5d4d44b2e4be937512125f0dd14fc41b12c5dc33 SHA-256: a8eb43e145f6b24ac44ba4285bcebcb316daf399993265dd87963507c4d004ba
154 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, indicating a phishing or malware distribution attempt. The document body, though partially corrupted, suggests a lure related to an "Electrical energy cost calculator". The ML classifier and ClamAV detection strongly support the malicious nature of this file. No scripts were extracted, but the embedded URL is the primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://cctraff.ru/wb?keyword=electrical%20energy%20cost%20calculator In PDF document text
    • https://static.s123-cdn-static.com/uploads/4444369/normal_5fceab2c5a3c5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476416/normal_60025a2122cb9.pdfIn PDF document text
    • https://temozune.weebly.com/uploads/1/3/0/7/130738928/lupisupodu.pdfIn PDF document text
    • https://kuxivudu.weebly.com/uploads/1/3/0/8/130813582/8c9a22b.pdfIn PDF document text
    • http://mozodulo.iblogger.org/liramalix.pdfIn PDF document text
    • http://swiss-family.space/josupefegunolikeko22w7w.pdfIn PDF document text
    • https://dutajidadu.weebly.com/uploads/1/3/4/7/134730474/vatunanufug-xerowazide-fopajenovijebi-fumujegodazug.pdfIn PDF document text
    • https://noparageselex.weebly.com/uploads/1/3/1/8/131856757/5420562.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450139/normal_5fe92e08f3de5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446496/normal_6007e002b8f4c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367959/normal_5fd9de7ff2784.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469836/normal_5ffa3caeaaa83.pdfIn PDF document text
    • https://zaxonoso.weebly.com/uploads/1/3/1/3/131381259/446ab85db053.pdfIn PDF document text
    • http://biggymstoe.com/bounce_tales_java_appxh6mk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kurejaj.epizy.com/illaoi_guide_s8.pdfIn PDF document text
    • http://voniziveput.rf.gd/sogorovivatawijujegobavu.pdfIn PDF document text
    • http://siwojanapav.epizy.com/32478237615.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_off000110ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AC 5024 bytes
SHA-256: 952fed66948c36e4b21122b6bf428c08aaebf4b4116b221a3a30c92e6ef09ab5
font_01_sfnt_off000121db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121DB 10472 bytes
SHA-256: f22b0e3cc982405ad8dbdd91b5108836dacb8ca087603a3a3051d1a716b27fd8

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