Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1cb99fb3e79d9ac…

MALICIOUS

PDF

85.0 KB Created: 2020-12-26 08:59:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 61444cb1a0d532b74f5f6d4b03567157 SHA-1: 3e332c1a5baecc562bd4f804a811515147293cb7 SHA-256: b1cb99fb3e79d9acc81c6e101d43efab2817b9d751429b84e36ab577038914ad
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and likely phishing-related. It contains a large number of external links, many pointing to PDFs, suggesting a link farm or SEO abuse tactic. One of the embedded URLs, 'https://trafficel.ru/strik?utm_term=block+hexagon+puzzle+apk', is a primary indicator of malicious intent, likely serving as a lure or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://trafficel.ru/strik?utm_term=block+hexagon+puzzle+apk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4476930/normal_5fd2c42c05e9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375209/normal_5fa937663732c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450336/normal_5fdd20c9eca4d.pdfIn PDF document text
    • https://bitujidup.weebly.com/uploads/1/3/4/5/134598072/31f98a.pdfIn PDF document text
    • https://duxetaxegijojem.weebly.com/uploads/1/3/4/8/134870405/2078935.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387808/normal_5fa40d09a6580.pdfIn PDF document text
    • https://tugojomabam.weebly.com/uploads/1/3/4/5/134588125/915849.pdfIn PDF document text
    • https://murenazomof.weebly.com/uploads/1/3/4/0/134012525/soniverodomuzamemud.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/xozeb/vector_addition_worksheet_key.pdfIn PDF document text
    • https://s3.amazonaws.com/mujevubutukoxu/uttara_kannada_janapada_feeling_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/bufexa/38426285220.pdfIn PDF document text
    • https://s3.amazonaws.com/saziwijaxodav/67625080995.pdfIn PDF document text
    • https://s3.amazonaws.com/vigevot/tapajegosadoporale.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2C 6440 bytes
SHA-256: 629123bfde0685c5f69bbdd27ec008bde0224d5c30af1dabb990f6ee33ea778e
font_01_sfnt_off0000ee20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE20 5152 bytes
SHA-256: 165833a87aa911bde56b6231466cc40cbf719e54a40f86924d94eec9965e8ca0
font_02_sfnt_off0000ffb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB3 2540 bytes
SHA-256: f8733cf274998d06e3f5923557b10e50631e663b2dfd4ed6a9cf87a2ad002034
font_03_sfnt_off00010a02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A02 10704 bytes
SHA-256: e40730ba38f85acb853cff64d4735c9c657721b2e9da99a81156552516243eb6
font_04_sfnt_off00012e93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E93 16788 bytes
SHA-256: 4852d66229331d46b3879f4c6b974dbc7a00cbbe9b44d8334b0b14bf6e2d26e3

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