Malicious PDF — malware analysis report

Static analysis result for SHA-256 d66e5f9d93d58974…

MALICIOUS

PDF

79.3 KB Created: 2021-02-11 23:50:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f26e0b27554f192a994e4b786c33ee28 SHA-1: 28e027ee31994e778bc09fb6b7fa643c7910b7b0 SHA-256: d66e5f9d93d589743ea728d1be825dcf1ef3f93974f0635abd6ba2c520f54efb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' suggests the document contains a large number of external links, with 'http://martans.space/plant_paradox_diet_recipesli4ui.pdf' being the first example. The presence of embedded URLs and the overall structure point towards a phishing or SEO manipulation attack, likely aiming to redirect users to malicious sites. No scripts were extracted, but the PDF structure itself is used to facilitate the attack.

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 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.
  • 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://bologen.ru/wb?keyword=d%20m%20r%20t%20full%20form PDF link annotation
    • http://martans.space/plant_paradox_diet_recipesli4ui.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447467/normal_5ff67f3d25bb9.pdfIn PDF document text
    • http://copyright-helps-team.com/87200841540d37uf.pdfIn PDF document text
    • https://vujilesozigo.weebly.com/uploads/1/3/4/0/134042384/507959b8d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494431/normal_5fee801367106.pdfIn PDF document text
    • https://vujemojijub.weebly.com/uploads/1/3/3/9/133997462/1602688.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365661/normal_5ffccdbd0c016.pdfIn PDF document text
    • https://xonifosanonozo.weebly.com/uploads/1/3/2/6/132680915/jatogufetix.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485166/normal_5fe40bbadbe8e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374963/normal_5fc98ace882e6.pdfIn PDF document text
    • http://oneplusonemain.xyz/iowa_accident_report_searchww7rk.pdfIn PDF document text
    • http://vsedlyatebya.xyz/51907261149r866i.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403936/normal_60040731c72b3.pdfIn PDF document text
    • http://technodom11.com/95456833663mnfh3.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/zabevog/medical_examination_report_d4.pdfIn PDF document text
    • https://s3.amazonaws.com/kevava/movie_counter_dual_audio_720p.pdfIn PDF document text
    • https://s3.amazonaws.com/nagev/75296985198.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_off0000fa8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8F 4524 bytes
SHA-256: 2cb0de7dba0e63835e661db3f5b9f5e32be5fb85ac683443dee7b0295f005e12
font_01_sfnt_off000109e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E1 11436 bytes
SHA-256: d79dbdb00cca740abafe5b1c503a764e4625df6dfb5ef9d23f70849964d17bbd

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