Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d7855209a0b6111…

MALICIOUS

PDF

78.3 KB Created: 2020-11-10 22:52:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: c12efecb912e88f775797b32a1534bc3 SHA-1: a9a93a23f4492371d61af3ddf7b1d77db992f487 SHA-256: 5d7855209a0b6111569d681f4e0772f510c5990a2964005190ae5fd6e84dc95d
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one identified as a malicious redirector. The document body, though heavily obfuscated, appears to reference weather information, a common lure for phishing or scam content. The presence of a link farm and the ML classifier's high confidence score further support a malicious classification.

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://traffmen.ru/123?keyword=weather+in+clifftop+wv In PDF document text
    • https://cdn-cms.f-static.net/uploads/4373788/normal_5f8b370e37109.pdfIn PDF document text
    • https://kagilovudugavap.weebly.com/uploads/1/3/1/1/131164538/dimiweru.pdfIn PDF document text
    • https://rivisoni.weebly.com/uploads/1/3/0/7/130739016/9327281.pdfIn PDF document text
    • https://lividuxu.weebly.com/uploads/1/3/4/3/134354071/7505264.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426407/normal_5f9aa4780f5f2.pdfIn PDF document text
    • https://kezojafedekekav.weebly.com/uploads/1/3/4/0/134096401/bafadaxazu.pdfIn PDF document text
    • https://jiwadurator.weebly.com/uploads/1/3/0/7/130776405/fejexusojevag.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3b160b4-47dc-472e-a0e1-b3300dbbe32c/shirley_jackson_the_lottery_sparknotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/815351e8-7258-4814-b661-34e1f1d80cbf/16760736687.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cf3eb7c-9505-4c77-9bff-eb3f41ac742a/dikamopafapoxiwitazuten.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfd94d02-032e-4d92-9aba-0ebab99941f9/noguxumuvufoduxegozalejob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc35041c-92fe-4aa0-bc2f-657828b56390/imaginarium_train_table_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df8223c7-72ff-4331-9d8f-59aa008fc536/duwowujokajen.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000102e0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x102E0 23572 bytes
SHA-256: e17ac7a5177cd34e07b59055f00ea1acc19db99c75e9358bcb11bec970060565
font_00_sfnt_off0000cc25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC25 5088 bytes
SHA-256: def901b24ed1f5d21410310804b578a294e3dd9d6a440b048b86c7a00e38c754
font_01_sfnt_off0000dd94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD94 10888 bytes
SHA-256: 6ab738e8724555d65011982789d640b9370f01391d910641d73152fa9b4faa97

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