Malicious PDF — malware analysis report

Static analysis result for SHA-256 37075e2e4d02a2f3…

MALICIOUS

PDF

89.2 KB Created: 2021-04-02 09:43:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16b4c9807e66c11ad2e75d66c1e86228 SHA-1: 79dd7a3100d041b39a95d1dbdef62db21016d309 SHA-256: 37075e2e4d02a2f324ff58b6c9f637d76622c9dd4727f506af01c3389b44930f
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a large number of external links, including one pointing to 'nipisod.ru/strik', suggests a phishing or SEO spam campaign. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards malicious content designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://nipisod.ru/strik?utm_term=is+milorganite+safe+around+pets
    • https://static.s123-cdn-static.com/uploads/4382430/normal_60046e9befe12.pdf
    • http://lobulezinovux.medianewsonline.com/latosar.pdf
    • https://static.s123-cdn-static.com/uploads/4380086/normal_5fcd2568e1f8e.pdf
    • https://static.s123-cdn-static.com/uploads/4386618/normal_5ff6759fad23e.pdf
    • https://cdn-cms.f-static.net/uploads/4484612/normal_5fdc147f36edc.pdf
    • https://cdn-cms.f-static.net/uploads/4481509/normal_605877ba64491.pdf
    • http://leledup.mypressonline.com/fezukevekipowib.pdf
    • http://nikibolerobika.getenjoyment.net/pexoxomom.pdf
    • https://static.s123-cdn-static.com/uploads/4447276/normal_5fc81a50017e9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/widetunipet/lujogifibeka.pdf
    • https://91506351-5699-48ce-85e7-8e7d071f4e87.filesusr.com/ugd/d775a9_3f36e3ea849b4089b4a59caef135d5fe.pdf?index=true
    • https://s3.amazonaws.com/genedonapubefe/week_by_week_guide_to_your_pregnancy.pdf
    • https://s3.amazonaws.com/tobovunoberiki/what_are_the_rules_of_wwe_wrestling.pdf
    • http://reladefuxuna.onlinewebshop.net/blood_group_antigens.pdf
    • https://b01ec662-dec5-4f54-b977-8708717d6054.filesusr.com/ugd/07e02c_f2496a777f034af3affa8880fc65b676.pdf?index=true
    • https://s3.amazonaws.com/gurupixabogivaz/nekupetolagijimejolosurod.pdf
    • https://s3.amazonaws.com/zalomi/messenger_app_2019.pdf
    • https://s3.amazonaws.com/julaxel/pataal_bhairavi_movie_free.pdf
    • https://s3.amazonaws.com/moduxanakuri/99885388818.pdf
    • https://e924225a-aa46-4bfc-8e56-7341551e1833.filesusr.com/ugd/54dfea_a8ff0025246849459e88bd34ffc22d68.pdf?index=true
    • https://s3.amazonaws.com/redegelesibif/37906201709.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_off0000fb0c.bin
e05cef12881a0cbfd7745c37e3f728a319d4237019fd593d8d5b012291883510		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0C 5296 bytes
font_01_sfnt_off00010cf2.bin
9ec15765eeadc17d5ac9dec16e4205303c14d67e21a400faf353957ec986a1cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF2 3280 bytes
font_02_sfnt_off00011a18.bin
9a36ac06b5beadacbf1694cad8d1573392811b616621ce52d64ab539ba8a941b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A18 11320 bytes
font_03_sfnt_off000140c0.bin
78d7809a7b8cf42832ca109e147e229b251621be9f928fc57bd93c407078b8d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x140C0 16436 bytes

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