Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c5cb1dcb114ac80…

MALICIOUS

PDF

110.3 KB Created: 2021-04-06 18:35:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: e223eb094bbfee23b57b60c97c80f912 SHA-1: 209595c353f830797525ee11cbeff141255edea9 SHA-256: 5c5cb1dcb114ac8021c71df341744bed9cb909a62d137a7e2704ae4adb359eb1
126 Risk Score

Malware Insights

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

The PDF contains embedded URLs and heuristics indicate it functions as a link farm, with one URL specifically mentioning 'data analysis using stata ulrich kohler pdf' to disguise its malicious intent. The ML classifier and ClamAV detection strongly suggest malicious activity, likely related to phishing or malware delivery via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://grossenbacher.co.nz/en/system/files/avoidance-training-certificates/tojawi.pdf In PDF document text
    • https://grossenbacher.co.nz/en/system/files/avoidance-training-certificates/4264017636.pdfIn PDF document text
    • https://www.blplegal.com/sites/default/files/webform/pifijolaj.pdfIn PDF document text
    • http://www.pacificsportfraservalley.com/sites/default/files/webform/zasadavatemomafupe.pdfIn PDF document text
    • https://www.blplegal.com/sites/default/files/webform/8025899801.pdfIn PDF document text
    • https://www.enwidth.com/sites/default/files/webform/resumes/60015669747.pdfIn PDF document text
    • https://www.natsihwa.org.au/sites/default/files/webform/tesogiruzan.pdfIn PDF document text
    • https://www.blplegal.com/sites/default/files/webform/lolavojirubopikumu.pdfIn PDF document text
    • https://www.enwidth.com/sites/default/files/webform/resumes/58607877977.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=data+analysis+using+stata+ulrich+kohler+pdfPDF link annotation
    • https://thesanfordschool.asu.edu/sites/default/files/webform/31460711967.pdfIn PDF document text
    • https://campusrec.princeton.edu/system/files/webform/putiwokareviwe.pdfIn PDF document text
    • https://www.healthdata.org/sites/default/files/resumes/sutuzosugogaw.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_off0000e318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE318 47628 bytes
SHA-256: 407a9211f4929311b1f9c35fe2118b1124bc65526d4e49b8e505134440507263
font_01_sfnt_off00017368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17368 5584 bytes
SHA-256: 3e28a39de9c65bcd29a8e76a07ab721bc4e90f2752b42664e2749d7b8afcf8f7
font_02_sfnt_off00018675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18675 11004 bytes
SHA-256: 2d535797bb9ad3eeebab3f8d516def77337ca68dfdb05f666e9658fbc75f6017

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