Malicious PDF — malware analysis report

Static analysis result for SHA-256 25f55e6facf92a55…

MALICIOUS

PDF

138.3 KB Created: 2021-05-21 09:45:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 6d089a796b89dd8edb9bbe3b4434e885 SHA-1: 5197a1f794184981e8f7e63233d97e79e181c056 SHA-256: 25f55e6facf92a55e6d458127d9bac8746c57b0f60989952947797f437c79d64
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/strik?utm_term=cuanto+es+un+decimetro+en+cm PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4378845/normal_605be598be3de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416671/normal_606747b918cdf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462066/normal_60550ade4f5b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403274/normal_60438f4de892c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456387/normal_60449f9f56a4b.pdfIn PDF document text
    • https://denupadifujufo.weebly.com/uploads/1/3/0/8/130813478/8878831.pdfIn PDF document text
    • https://piwusobalusuwav.weebly.com/uploads/1/3/2/3/132303181/91413da1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487424/normal_6001eebec4cc6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380088/normal_60248c7261b84.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374002/normal_6041b959a9002.pdfIn PDF document text
    • https://komamezumef.weebly.com/uploads/1/3/1/3/131398541/4741725.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427499/normal_5fe9e4ca6e795.pdfIn PDF document text
    • https://wapofowivukixog.weebly.com/uploads/1/3/4/0/134017250/1736277.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481516/normal_60439d561f359.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384639/normal_604981d00ae62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417543/normal_605f54fca4722.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451542/normal_5ffb700b8d1ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411500/normal_601092a566ef7.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/zarevizebi/34112948376.pdfIn PDF document text
    • https://s3.amazonaws.com/tazopaju/mowaka.pdfIn PDF document text
    • https://s3.amazonaws.com/firigugixujotov/java_8_free_oracle.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/the_chocolate_touch_book_online.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001c1fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C1FE 4956 bytes
SHA-256: e4a2d872fad497cd10d9e1fb692f43ed8b49b7d481920a5a886d96ef329df875
font_01_sfnt_off0001d2c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D2C0 16492 bytes
SHA-256: 6d126163e9ce1a4c4e1b62355e2ef8ac909609f8ebb47672a4b368a09a4935d0
font_02_sfnt_off000202bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x202BF 16636 bytes
SHA-256: 193c29f3304612e67e751f1c9d233ac9cafebe95ab8e32182abbcb0b81e97cee

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