Malicious PDF — malware analysis report

Static analysis result for SHA-256 b45d0c223921b04b…

MALICIOUS

PDF

81.6 KB Created: 2020-12-27 07:55:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: acff44165adc818cee08fdd338b5ee87 SHA-1: f0181d299c7d696918951e21eafe7b46a3921599 SHA-256: b45d0c223921b04be2a3f45ed3cf67ab9137c012c045eb29d1b8b838fe511a85
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a social engineering attack (ClickFix). It contains a large number of external links, suggesting it is part of a link farm or phishing campaign. The embedded URLs point to various PDF files hosted on external domains, likely serving as lures or further stages of the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://trafftec.ru/strik?utm_term=map+marker+minecraft+mod PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4382208/normal_5f912e8bec251.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462096/normal_5fd1043fe41f1.pdfIn PDF document text
    • https://dutajidadu.weebly.com/uploads/1/3/4/7/134730474/tizedeniluxiz-gefowigujotubu-senunomikale.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454966/normal_5fbb3f6377f90.pdfIn PDF document text
    • https://pidadilux.weebly.com/uploads/1/3/4/6/134666204/kovolobox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365562/normal_5fd9cf7340c7a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408871/normal_5fa215d6969e9.pdfIn PDF document text
    • https://kunobozawi.weebly.com/uploads/1/3/1/4/131453145/lijexomapo_rexav.pdfIn PDF document text
    • https://cdn.sqhk.co/zotipimesaza/jfUhgMg/7436874309.pdfIn PDF document text
    • https://dexuganepo.weebly.com/uploads/1/3/1/6/131608037/bobetover.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375528/normal_5f8c117935a2f.pdfIn PDF document text
    • https://cdn.sqhk.co/jumifokujuje/fhiWitv/kasozererulo.pdfIn PDF document text
    • https://finijuzado.weebly.com/uploads/1/3/4/4/134444754/ba4b7c922.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA43 5160 bytes
SHA-256: d232a3da7b37584d1f02de8c4f5ae0835de6bcf5f0f85f0c45a0fce75e1582fe
font_01_sfnt_off0000fbd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD1 11636 bytes
SHA-256: 5147593d1585cd1ec3ff3a36298ade65a4e8df29aa5096de1c00e13103128edc
font_02_sfnt_off00012390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12390 16064 bytes
SHA-256: 6f41d85279102efce3c4bd26fddb767baf9b68a4f55e239fba9bedc2a2d3b953

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