Malicious PDF — malware analysis report

Static analysis result for SHA-256 55a07af40fdd331a…

MALICIOUS

PDF

84.2 KB Created: 2021-03-03 03:44:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5b1753e8c2c0db259d8b6fbe6dff572d SHA-1: 6912f6a4ee27635054a2431af390af8a141a0b4a SHA-256: 55a07af40fdd331a040c4f7bccfed5e49c18d6ec38f44bc4889a75522fc5bcda
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The document body, though heavily obfuscated, contains text related to "Twilight series download in hindi", indicating a lure to attract users. The presence of PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, along with ClamAV detection as Pdf.Phishing.Trojan, strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://golowaki.ru/aws?utm_term=twilight+series+download+in+hindi PDF link annotation
    • https://cdn.sqhk.co/tatidukigag/hjXjegd/98906610893.pdfIn PDF document text
    • http://lnstagram-help-businesss.com/strategic_advertising_management_ebook6lb1j.pdfIn PDF document text
    • https://xegazoniwenopuk.weebly.com/uploads/1/3/6/0/136011370/balem-bofudep-kukukugol-gedisogu.pdfIn PDF document text
    • http://good-production9.site/how_to_show_interface_status_in_cisco09cx7.pdfIn PDF document text
    • http://tofoxewesaxizuz.mywebcommunity.org/75308102865.pdfIn PDF document text
    • https://cdn.sqhk.co/gisatajofo/vjhT4gj/59591857718.pdfIn PDF document text
    • https://cdn.sqhk.co/zukasedu/hjjeihG/funutolinatiredese.pdfIn PDF document text
    • http://viniveba.mywebcommunity.org/99877593820.pdfIn PDF document text
    • http://sokixatov.mywebcommunity.org/zekesesirurimogigazope.pdfIn PDF document text
    • http://stroymarketmetal.ru/97021102079g9pys.pdfIn PDF document text
    • https://vuwezamubom.weebly.com/uploads/1/3/0/8/130814902/87cf11b6d.pdfIn PDF document text
    • https://cdn.sqhk.co/wexufenu/njaijqY/lucky_block_command_bedrock.pdfIn PDF document text
    • https://xaxidotuviw.weebly.com/uploads/1/3/0/9/130968933/3d3c4ad0785c37.pdfIn PDF document text
    • https://dovavifedudefew.weebly.com/uploads/1/3/2/7/132710721/7580540.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450512/normal_5ff628d570922.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://sogivuwe.onlinewebshop.net/myers_briggs_relationship_compatibility_chart.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA76 5128 bytes
SHA-256: 0f9405f42ac29180d82f41dcd8598e1ba436ba30a6921997d2e8b2d8f25f752f
font_01_sfnt_off00010bf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF1 11484 bytes
SHA-256: 619d290393c222f74efc60f4d1271a3735db676d74c649b07a23af61ccd7fffb
font_02_sfnt_off00013379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13379 4144 bytes
SHA-256: 2b660aca7052ed46cebc929b0d7937bf0afb79957e75e5c58e12834e05730e76

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