Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e79cd9da628d822…

MALICIOUS

PDF

77.9 KB Created: 2020-11-26 03:27:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d84f31a148af8b78a1ed86ba45751ee7 SHA-1: 12a31e918aa0766bffcd02eacf3d9cc357594ba6 SHA-256: 4e79cd9da628d822ceb46a8d366139ef8a40acff74eae33679e05ace85b4135e
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' indicates the presence of a large number of external links, with 'https://sidatugalelukad.weebly.com/uploads/1/3/4/6/134639108/1f7b1991.pdf' being the first identified. The 'PDF_URI' heuristic also points to 'https://traffking.ru/strik?utm_term=chromebook+cart+organization' as an external URI. While no scripts were explicitly extracted, the nature of the link farm suggests a phishing or SEO manipulation attack, often facilitated by embedded JavaScript in PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffking.ru/strik?utm_term=chromebook+cart+organization
    • https://sidatugalelukad.weebly.com/uploads/1/3/4/6/134639108/1f7b1991.pdf
    • https://cdn-cms.f-static.net/uploads/4383160/normal_5fb8a882b4da3.pdf
    • https://cdn-cms.f-static.net/uploads/4425909/normal_5fa0cd79c10eb.pdf
    • https://cdn-cms.f-static.net/uploads/4384642/normal_5fb2ad2f415df.pdf
    • https://cdn-cms.f-static.net/uploads/4366375/normal_5f8beb5ff1d9a.pdf
    • https://fotijaxak.weebly.com/uploads/1/3/4/1/134108731/8341827.pdf
    • https://korodovijexud.weebly.com/uploads/1/3/4/5/134512412/fepekusesiruluzot.pdf
    • https://cdn-cms.f-static.net/uploads/4465704/normal_5fa2bd5987dbd.pdf
    • https://cdn-cms.f-static.net/uploads/4377410/normal_5f8a6d197b287.pdf
    • https://cdn-cms.f-static.net/uploads/4417207/normal_5fad4548a13e0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/876d2521-8fe7-4067-942e-246f6c41f15e/wivoz.pdf
    • https://s3.amazonaws.com/patotale/sweet_potato_vine_bulbs.pdf
    • https://uploads.strikinglycdn.com/files/354308a1-bd4b-4478-9b83-311807ac9621/49441895522.pdf
    • https://s3.amazonaws.com/jimugivos/excel_vba_file_from_hyperlink.pdf
    • https://uploads.strikinglycdn.com/files/684fc0f1-6ec4-4bb2-8da2-e64946e663cf/bubuwutasero.pdf
    • https://uploads.strikinglycdn.com/files/15633d0b-122c-48e9-b1e7-0549e4ce069b/the_lively_art_of_writing_free_download.pdf
    • https://uploads.strikinglycdn.com/files/3d72494d-fb21-41ca-a36a-19e9ab6d5466/rutodavuvederij.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1a2.bin
2b239b76a4fd318790999d5125312428f6c72e894489dbe2122164d395a81fb6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A2 5068 bytes
font_01_sfnt_off0000e2c0.bin
5b6d808c323dc74f953875aa47b453a34f28dfb09bba2b725431677990ef56fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C0 10288 bytes
font_02_sfnt_off0001062c.bin
b2563e85233037e3c2780690ed1455257f868516b5a962e54e6ffe29314c9cb1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1062C 16312 bytes
font_03_sfnt_off00011bb7.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB7 4324 bytes

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