Malicious PDF — malware analysis report

Static analysis result for SHA-256 51c004e967c2f4fe…

MALICIOUS

PDF

82.7 KB Created: 2021-03-06 07:26:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: e97b9903e02756641d33c80a44f89824 SHA-1: 207758e49e8f089a3403ff7b0be872f4af849010 SHA-256: 51c004e967c2f4feee720f6cd84821b34754e01d87394f40a0fb825c900cc2ad
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to direct users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URL 'https://baarspo.ru/strik?utm_term=my+husband%2527s+secret+life+lifetime+movie+spoiler' is a primary indicator of the lure used.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://baarspo.ru/strik?utm_term=my+husband%2527s+secret+life+lifetime+movie+spoiler PDF link annotation
    • https://pobunusegem.weebly.com/uploads/1/3/4/4/134460984/dewomenefegega.pdfIn PDF document text
    • https://mejonozawus.weebly.com/uploads/1/3/4/0/134016798/3232878.pdfIn PDF document text
    • https://dotomogef.weebly.com/uploads/1/3/4/7/134760479/vemul.pdfIn PDF document text
    • https://nutagabe.weebly.com/uploads/1/3/5/3/135325028/5228849.pdfIn PDF document text
    • https://papenuxid.weebly.com/uploads/1/3/0/8/130874395/6863205.pdfIn PDF document text
    • http://komujevakikumu.22web.org/53063049055.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e3055f73-6236-423b-b810-4bc1a15f300f.filesusr.com/ugd/fa12d1_39dcc9ea722c4840bc667310c1693655.pdf?index=trueIn PDF document text
    • http://bowukedogatowo.epizy.com/bronze_colored_formal_dresses.pdfIn PDF document text
    • https://4694dce0-4d1e-4c77-b4da-d1f025f82355.filesusr.com/ugd/fb332b_e63a98148668405c955b5816902f69c2.pdf?index=trueIn PDF document text
    • http://tujatubaniza.epizy.com/noledizeje.pdfIn PDF document text
    • https://4a1cfc67-5981-466d-a13b-75576fe7431f.filesusr.com/ugd/64e449_0f8fd48484b147de8383fe398aa9dccb.pdf?index=trueIn PDF document text
    • https://3682d434-6e27-4ac8-9ac2-d3ec24fa429c.filesusr.com/ugd/9b5f63_c638d48f07804eeaa8f83d07f15d788b.pdf?index=trueIn PDF document text
    • https://f95b5726-9955-4dff-afd2-80a4c314a5a0.filesusr.com/ugd/b0b521_4128248fb57b4c688fa64db91821b606.pdf?index=trueIn PDF document text
    • http://talifox.rf.gd/wawapava.pdfIn PDF document text
    • https://144ece88-722e-4d59-a9d1-ae16887514c2.filesusr.com/ugd/48b17f_399f158b406243a3b51aaf52d33144bf.pdf?index=trueIn PDF document text
    • https://994180ce-385f-4272-9833-4a204a825e0f.filesusr.com/ugd/ec0c41_814ea5286ef647b3b3c66a2c0a8cabac.pdf?index=trueIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B4 5736 bytes
SHA-256: 9def7f3c1418806974fa36b94a02d46af0a50009954fdc046e4aa5c3e0a97523
font_01_sfnt_off0000f721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF721 2192 bytes
SHA-256: e3f3a55895bd16912a6eeba4cf2d96c6de995318a9a6926762953235f948a7f3
font_02_sfnt_off00010134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10134 10856 bytes
SHA-256: b40960b12059aab2adc0296599c7ae3df186f64d7a7554e58bc62ea5f21ee781
font_03_sfnt_off000125fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125FE 16168 bytes
SHA-256: 0216150ac0e5ade23b072752459620ec704bdac01526bfbadd96d51f96873ef3