Malicious PDF — malware analysis report

Static analysis result for SHA-256 64eea8be0ad4b7db…

MALICIOUS

PDF

80.7 KB Created: 2021-03-14 20:56:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 3be2f6811a6cbf9a79a9317cf1733aee SHA-1: 7cbacffec1d7d392f5edcab65cccc38e8470fed9 SHA-256: 64eea8be0ad4b7db24a32b3862e9ca137efc525d47189657cef483034f766d27
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one specifically pointing to a suspicious domain ('nipisod.ru') that is likely part of a phishing or SEO spam campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/award?keyword=a+course+in+behavioral+economics+2nd+edition+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4391308/normal_5ff96415b4432.pdfIn PDF document text
    • https://ruvawuwejijexut.weebly.com/uploads/1/3/0/8/130814193/a244a08f766aed.pdfIn PDF document text
    • https://nupanirofedodav.weebly.com/uploads/1/3/4/4/134470916/daminakuw.pdfIn PDF document text
    • https://bozuzagon.weebly.com/uploads/1/3/4/6/134666742/386da1d5504534b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425235/normal_6045c12923cb8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419218/normal_5fdbe6c0b2a3d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372085/normal_5fe3f019c7a48.pdfIn PDF document text
    • https://kusovagojevo.weebly.com/uploads/1/3/4/8/134883394/4318352.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474977/normal_5fde683f641c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423154/normal_601dba2844a63.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/popisiburewixuj/percy_jackson_the_titans_curse_movie_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cfda39a-1fdb-493a-b549-8f9358eaf9f1/sims_3_create_a_world_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/wofaxil/pebuvuwotuw.pdfIn PDF document text
    • https://s3.amazonaws.com/fosalizuzu/96396236471.pdfIn PDF document text
    • https://s3.amazonaws.com/xubifupi/42704757179.pdfIn PDF document text
    • https://s3.amazonaws.com/zugutixe/comrade_in_america_cia_bgm.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17899dbe-a8ee-4754-919a-000464f79b09/stihl_weed_trimmer_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/purixifusipelid/how_to_fix_dometic_e7_error_on_air_conditioner.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawexawinogad/bifuketi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af1be1c2-4066-4795-aabd-eff84fc57d5c/how_to_ice_maker_water_line.pdfIn PDF document text
    • https://s3.amazonaws.com/kifutizijebuj/structure_text_language_in_plc.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://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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E6 5716 bytes
SHA-256: db9c313e99cbb27e7322ae2d5c64fd0243045d1397df0ed263ea8b329dfb9ee3
font_01_sfnt_off0000f835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF835 11108 bytes
SHA-256: 8f6663edc62584937a37b0649617b0f943afd8813808aff8feaa0e5ce13b125d
font_02_sfnt_off00011e4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4D 16084 bytes
SHA-256: 3dd6252bb62cdcc21e2b76bdeb68ba6c8db9c2d08edae94764e010183c5b1848

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