Malicious PDF — malware analysis report

Static analysis result for SHA-256 4842139736b3e984…

MALICIOUS

PDF

70.6 KB Created: 2021-01-11 07:58:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 623f42f51a417235e099e0d5ecf51d25 SHA-1: 7b40d1d9cabe7bf659ad9024ea7c3c5750e69afc SHA-256: 4842139736b3e984e518f5fb753112d7a37e3078e5f7809a30e89e73de8c528c
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying it as a malicious redirector and a link farm. One prominent URL, 'https://traffine.ru/aws?utm_term=cbr+comic+reader', is flagged as malicious. The document body, though heavily obfuscated, contains references to 'Cbr comic reader' and 'wkhtmltopdf', suggesting a lure to disguise malicious intent. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or malware delivery.

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
  • 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://traffine.ru/aws?utm_term=cbr+comic+reader In PDF document text
    • https://cdn-cms.f-static.net/uploads/4393632/normal_5f8ff9c5cd4e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368747/normal_5fd38e1e7340d.pdfIn PDF document text
    • https://site-1176447.mozfiles.com/files/1176447/three_kingdoms_online_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492600/normal_5faa3ca700257.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376369/normal_5fa57ab2a8f96.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454547/normal_5fcdaa1490d84.pdfIn PDF document text
    • https://wimelavejitovuv.weebly.com/uploads/1/3/4/5/134597731/zobagovijikuzap.pdfIn PDF document text
    • https://site-1173660.mozfiles.com/files/1173660/slot_car_track_set_kmart.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459318/normal_5fca8ace2c10e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449170/normal_5ffb8ab01905b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413112/normal_5feaf971962b5.pdfIn PDF document text
    • https://dazowuxope.weebly.com/uploads/1/3/4/3/134319454/sewivokog-neguluxulawukok.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/jalasilunaz/format_code_sql_management_studio.pdfIn PDF document text
    • https://s3.amazonaws.com/neviwove/android_module_dependency_implementation.pdfIn PDF document text
    • https://s3.amazonaws.com/pazerogasarinu/93385145142.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_off0000d999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD999 4920 bytes
SHA-256: 76e52c48af7ab0b49d2c25f0f7ecc56450a24b711f1b9ec0dfdd26baf20c5d6e
font_01_sfnt_off0000ea31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA31 10296 bytes
SHA-256: dc0b1f0ce333932b5b2964f95cc5d4e21dfbebca30ef706fc0da58691fc54811

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