Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a97dccce3cd6a3a…

MALICIOUS

PDF

76.5 KB Created: 2021-04-18 13:24:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bab462feb420e073b95341beef8c6ba9 SHA-1: 7b054d52958976a6388c0e5eaa5645cb51b27112 SHA-256: 1a97dccce3cd6a3a227828cb4ba83d771eb8e8b01f0ad3d3864b00e56d4e71e7
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to manipulate search engine results or redirect users to potentially harmful sites. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan. While no scripts were explicitly extracted, the presence of numerous external URLs indicates a likely attempt to download or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/strik?utm_term=how+to+learn+to+code+for+beginners
    • http://telgrm.site/my_cloud_storage_device06z0q.pdf
    • https://gitujibexilen.weebly.com/uploads/1/3/1/4/131406430/susas.pdf
    • https://godikifamubexi.weebly.com/uploads/1/3/4/6/134622632/voromiguwi-bamudukunusobin.pdf
    • http://kamini33.ru/la_carcacha_lyrics_in_english3lk68.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/limepusotanal/dadiv.pdf
    • https://b5526579-b22d-45a0-8251-9885a72cf3eb.filesusr.com/ugd/0cd019_c9aa0c4d5a4140c2ac1bf046f780af62.pdf?index=true
    • http://kalilom.epizy.com/adolescence_medley_sub_indo.pdf
    • https://s3.amazonaws.com/bojafazes/54379173099.pdf
    • http://satuzolo.epizy.com/96733762437.pdf
    • https://ee42ee57-4547-4a8c-8a66-6cccb7f6869d.filesusr.com/ugd/2a9ad2_091736b2f49a48f9a07c4172e8ab29df.pdf?index=true
    • http://bogigipoja.epizy.com/29233668712.pdf
    • https://s3.amazonaws.com/kufazete/list_of_stock_tickers_download.pdf
    • https://b913155d-2712-4fd4-bcc6-651970a8c456.filesusr.com/ugd/e39924_29a54056601440a19655508d6e849f01.pdf?index=true
    • https://51956041-da35-40aa-96c1-085c1f47c80d.filesusr.com/ugd/e6e573_6630afe76d8442e5b0f43b65a5db9b6f.pdf?index=true
    • http://zumaruzafomadik.rf.gd/korapulesexinesenadu.pdf
    • https://s3.amazonaws.com/fotepopunaj/8489800426.pdf
    • https://s3.amazonaws.com/wozoxub/xolabewajazadozuxogutubug.pdf
    • https://s3.amazonaws.com/zuniverijesud/grocery_shopping_list_blank_template.pdf
    • https://s3.amazonaws.com/bidivo/what_does_parkour_mean.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e052.bin
2ae79764e94997cee36d29408f6f3273bdeae2a9187ae24cf3f1a85e4bbec36c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE052 5172 bytes
font_01_sfnt_off0000f201.bin
a23f0eaa3d573dcae2f8d67b570310dce939734f515a9853adf38d729c93207e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF201 10696 bytes
font_02_sfnt_off000116a7.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116A7 4324 bytes

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