Malicious PDF — malware analysis report

Static analysis result for SHA-256 852b2910efcd6f45…

MALICIOUS

PDF

69.2 KB Created: 2021-04-05 00:59:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4371483ec212f545cf6ee8617f6788f SHA-1: b52531fa53552de885e6da3844617abcc928cfa1 SHA-256: 852b2910efcd6f458fa8bd4f90bcc6fe00a92130c3ab912ed796b2105202eeea
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or distribution mechanism. ClamAV identified the file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The embedded URL heuristic suggests the document is designed to direct users to these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://botokaw.ru/wix?keyword=sea+turtle+swimming+gif
    • http://monongzhlh.space/el_reino_de_este_mundo_alejo_carpentier6hp31.pdf
    • http://gvidilon.ru/zevag93d6z.pdf
    • http://souve.me/96396971104nwor7.pdf
    • https://vimavopama.weebly.com/uploads/1/3/4/7/134769365/denap-fidedado-xuxugaki-fekitagagebo.pdf
    • https://romenazojojeles.weebly.com/uploads/1/3/0/7/130775884/4372257.pdf
    • http://wonder-ita.space/hita_ambrish_ji_bhajan_videoqqeb3.pdf
    • http://filfex.ru/how_to_change_samsung_inline_water_filterkrqfp.pdf
    • https://wenabavur.weebly.com/uploads/1/3/1/3/131379405/7135526.pdf
    • https://pefodiral.weebly.com/uploads/1/3/4/4/134476409/7016755.pdf
    • http://com-servers.online/what_became_of_nicodemus_in_the_biblegkrwc.pdf
    • http://mazafaka69pussy.online/zukapesitovasaj9ady.pdf
    • https://riwozetamozu.weebly.com/uploads/1/3/4/3/134331456/8614237.pdf
    • http://temilops.xyz/analyzing_categorical_data_worksheet9msu4.pdf
    • http://zusiwibewire.mypressonline.com/cuento_blancanieves_y_los_siete_enanitos.pdf
    • https://semogabetik.weebly.com/uploads/1/3/1/4/131482882/1a973bf.pdf
    • https://xesefuwaruju.weebly.com/uploads/1/3/6/0/136088059/lepikakenewo.pdf
    • https://kagozekexep.weebly.com/uploads/1/3/5/9/135956698/dekozez.pdf
    • http://gapijet.scienceontheweb.net/65575271597.pdf
    • http://toportt.online/how_many_episodes_of_death_note_are_there_in_total6ciw2.pdf
    • https://boxusopusaw.weebly.com/uploads/1/3/1/3/131398197/8938121.pdf
    • http://rupaduwovuw.getenjoyment.net/1333054983.pdf
    • https://pafirolexorawu.weebly.com/uploads/1/3/4/6/134612045/butonojopewo-betawakuwuka.pdf
    • http://mebevevi.mywebcommunity.org/2011_hyundai_sonata_2.0t_owners_manual.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ec560393-4650-4708-bf0c-d08fceb8458c.filesusr.com/ugd/ca69db_45c7b9f235624bfd9b30d49e38ff9051.pdf?index=true
    • https://3176e400-c268-4dc0-8d69-08eae86937f8.filesusr.com/ugd/ea2f88_bad16a794f734054aa859ae00c7e80d7.pdf?index=true
    • 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d54d.bin
6e42a901e1cee629f4d835097a61b7f4c3188bbe1854d8f3b87212fe86028cf5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD54D 5284 bytes
font_01_sfnt_off0000e73e.bin
05a2f5a266006a28be8c325d28613aa322f935d9a9f1e08325816214c87eca41		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE73E 9344 bytes

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