Malicious PDF — malware analysis report

Static analysis result for SHA-256 5546c7c3c2d41487…

MALICIOUS

PDF

70.7 KB Created: 2021-02-17 08:52:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 7566ef29684b85f819d2275cf73e98ed SHA-1: 095a89dc7b2f11a1a6555295fae53f9728783151 SHA-256: 5546c7c3c2d4148751b3a0017e1b3d08847397272926c28bcbe9e3fab9285597
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, with at least one identified as a malicious redirector. The heuristic firings indicate a malicious redirector link and a link farm, suggesting the document's primary purpose is to direct users to potentially harmful sites. Although no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • 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://yafferge.ru/strik?utm_term=asus+b85m-e%252Fbr+manual In PDF document text
    • http://vibawukukar.iblogger.org/football_match_schedule_2018.pdfIn PDF document text
    • https://losebevaxefot.weebly.com/uploads/1/3/5/3/135347065/6865377.pdfIn PDF document text
    • https://lumovomudin.weebly.com/uploads/1/3/4/7/134704265/memufujudosug_wimenejami.pdfIn PDF document text
    • https://gafepodaxo.weebly.com/uploads/1/3/4/6/134606739/022d22475ed0708.pdfIn PDF document text
    • https://jokunotewe.weebly.com/uploads/1/3/5/3/135314966/jikotuzurewozibe.pdfIn PDF document text
    • https://lopowizuxo.weebly.com/uploads/1/3/4/4/134438001/jamonijetatujibixati.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pazerogasarinu/goweviziwukebez.pdfIn PDF document text
    • http://xatudoxi.epizy.com/wewegelik.pdfIn PDF document text
    • http://bovuzigaratufob.rf.gd/gurumogemujewivi.pdfIn PDF document text
    • https://s3.amazonaws.com/gidibesuxi/zozeviderunapemedejuxemad.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/gabriel_s_oboe_flute_sheet.pdfIn PDF document text
    • http://gebozobab.epizy.com/street_fighter_4_pc_zip.pdfIn PDF document text
    • http://bafimilatape.epizy.com/kofixenujekabinivoxer.pdfIn PDF document text
    • https://s3.amazonaws.com/bisiku/toefl_exam_preparation_book.pdfIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/rakowe.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_off0000d49c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD49C 5348 bytes
SHA-256: 891fdce2b3f4891762508d7d4b38792f4954956a9af0b989678172e54937849b
font_01_sfnt_off0000e6c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C1 11696 bytes
SHA-256: b9e2c322763e98d43c5e2fcd59ff1269655e6a418c4ad50ef27eb0cb8e2044c7

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