Malicious PDF — malware analysis report

Static analysis result for SHA-256 77b6bdb2b70ef6dc…

MALICIOUS

PDF

75.7 KB Created: 2021-03-27 09:50:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: a7e76b0d7b33d241dbac23e3f4b3cd0f SHA-1: c2a6c667f9ffa264a436286a1a476ec2565f7cda SHA-256: 77b6bdb2b70ef6dca5fe212a95645aa525f8aca983fee61bcc9c6761bfee4231
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, indicating a link farm or redirection scheme. The heuristic 'PDF_SEO_LINK_FARM' specifically flags a large number of external PDF links, suggesting a malicious intent to drive traffic to potentially harmful sites. The ML classifier and ClamAV detection further support the malicious nature of the file. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing or traffic-generation attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/wix?keyword=que+son+los+electrones+de+valencia+ejemplos PDF link annotation
    • https://jusodizepo.weebly.com/uploads/1/3/1/0/131070216/xuxunapezema.pdfIn PDF document text
    • https://tupinikuwexopej.weebly.com/uploads/1/3/1/0/131070806/govubosuf_dovijafirojib.pdfIn PDF document text
    • https://votilolezin.weebly.com/uploads/1/3/4/3/134307270/6162897.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460042/normal_601b3a43837da.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500887/normal_5fecb3681745b.pdfIn PDF document text
    • https://bikanagika.weebly.com/uploads/1/3/4/4/134461715/lisokusonamug.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/dafumuxitupav/river_dell_wordly_wise_book_8_answers.pdfIn PDF document text
    • https://f2d828cf-06d9-46ea-85af-d88b0bc20d44.filesusr.com/ugd/501a20_d73d245df6c544aeb4b3eb63f484a868.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pokorevalaxex/49680511115.pdfIn PDF document text
    • https://9539e3d7-93ad-434a-85ac-22bd9bdb82bb.filesusr.com/ugd/df7b34_c5dd107333a7497599905a3ccb502061.pdf?index=trueIn PDF document text
    • https://bc732cde-fb09-4fee-8ab5-c82a45a1131b.filesusr.com/ugd/2ac701_9e47bb42b5254a3f9c85d1a101163484.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kegovev/datigelis.pdfIn PDF document text
    • https://0f0532cb-4478-41f9-91a1-cf277c4732ec.filesusr.com/ugd/8acad3_98c43a4eaedb459798f9e030ddc9a442.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/galinikagopit/nuranisupisubewutawawav.pdfIn PDF document text
    • https://4ac36a2f-1533-488b-b282-cf34cdace458.filesusr.com/ugd/bcfc12_1887edfff6f6415d98b2509889edb9c7.pdf?index=trueIn PDF document text
    • https://aabf49e0-5477-4fd2-8456-a986ef8f2a87.filesusr.com/ugd/9e14ca_4b8bd5e2dfe24eb9b2108ca93ee10333.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pobixedele/website_tool_mac.pdfIn PDF document text
    • https://ecf8b3bd-8201-449f-a39c-156acd88681e.filesusr.com/ugd/97634b_1ecb8535d0984b929a82f9addb883c45.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nokiva/17204544138.pdfIn PDF document text
    • https://s3.amazonaws.com/xefezesebusu/what_happens_if_your_cdl_expires_in_oklahoma.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e79f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79F 5416 bytes
SHA-256: 1504ddeecba01897e7e89a5a5ddb13dbc0493d7962b3791f370cb6ef12190b09
font_01_sfnt_off0000f9fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FC 11644 bytes
SHA-256: 008d63799654fd2557aec4d9f4d79fbbcbd07ae953b8b403e82e9270aa07e046

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