Malicious PDF — malware analysis report

Static analysis result for SHA-256 83bdb89ac46db5c6…

MALICIOUS

PDF

82.1 KB Created: 2021-04-05 23:56:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bccab1e38e666a51437f87326e4ca6a7 SHA-1: 085c9432ea4e7542d005075e6856d3e42dd4cabe SHA-256: 83bdb89ac46db5c69c6a7ba0794b643237269be268ed35779e6837acfcea8f7b
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a PDF SEO link farm. One of the embedded URIs, 'https://seumenha.ru/wix?keyword=tipos+de+metodologias', suggests a lure to a website that may be used for phishing or SEO manipulation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://seumenha.ru/wix?keyword=tipos+de+metodologias
    • http://midunetojonawiw.mywebcommunity.org/vadixudezesasede.pdf
    • https://cdn.sqhk.co/jibezilesu/XgdtSjm/pizupubu.pdf
    • http://bimonetejatoleb.mygamesonline.org/bedford_reader_9th_edition.pdf
    • https://cdn.sqhk.co/bowevuva/MGylxgc/love_quote_broken_heart.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9c9472f0-fd1e-437b-87b9-092797b0e1ad/netgear_gs108pp_power_supply.pdf
    • https://uploads.strikinglycdn.com/files/eb7d1121-746c-4dc5-8fbe-6b48b63411bd/2549700300.pdf
    • https://s3.amazonaws.com/fuwuzerijofa/walmart_hours_omaha_nebraska.pdf
    • https://uploads.strikinglycdn.com/files/117c7940-62ab-4ef4-a382-469f737800f1/94920951636.pdf
    • https://s3.amazonaws.com/zumomasugipeno/839927273.pdf
    • https://535a9070-e28a-464b-adc5-c02ad08be00b.filesusr.com/ugd/9df9d6_33d8c4b96a184af4a8b4b91fa98b54a8.pdf?index=true
    • https://s3.amazonaws.com/sajezife/90765669329.pdf
    • https://uploads.strikinglycdn.com/files/8f691ccf-d360-4410-99e1-63af420ce38a/the_right_stuff_tom_wolfe.pdf
    • https://uploads.strikinglycdn.com/files/ef9ae476-3b8a-4642-b2fb-bae1028a527b/gowebudejagulewirezulu.pdf
    • https://s3.amazonaws.com/zatasipezeg/samsung_rf263beaesr_aa_door_shelf.pdf
    • https://901c4554-6fda-40bf-8344-1f1538f5dc06.filesusr.com/ugd/a76634_e4599ba76c5844798ff17fd80c1ebd57.pdf?index=true
    • https://8ed7b8cb-9bae-4def-ad9b-66b28cd11f91.filesusr.com/ugd/740d8c_c1172ef083064aaf858ab8dcf1f46e87.pdf?index=true
    • https://s3.amazonaws.com/tubukeganuji/how_much_did_it_cost_to_rebuild_europe_after_ww2.pdf
    • https://s3.amazonaws.com/senodiw/58109405868.pdf
    • https://s3.amazonaws.com/pezofut/64443400085.pdf
    • https://s3.amazonaws.com/lurutopobi/4023269644.pdf
    • https://6c49ff76-e13b-46da-8354-2e633d56f736.filesusr.com/ugd/211c2d_5ac86044ac264291be9c0c7bfd3475d7.pdf?index=true
    • https://s3.amazonaws.com/rutufokedizon/igcse_english_informal_letter_format.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eeea.bin
096363288d613f368b947ce54a9490ba810509784d8ba20743e714f73272d97c
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEA 5132 bytes
font_01_sfnt_off0001004f.bin
a12fe58936bf8c590120675f9501453714dc0e955cd437dfd954b8536d6375fa
pdf-font-stream PDF embedded font (sfnt) at offset 0x1004F 10780 bytes
font_02_sfnt_off000123c6.bin
2c5f51a476b4274b6b900fbba81fc97c04b4f1697b1aac53cf696a9c53e0885f
pdf-font-stream PDF embedded font (sfnt) at offset 0x123C6 16368 bytes