Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae9f7880d38c2f4d…

MALICIOUS

PDF

90.3 KB Created: 2021-05-30 09:18:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ac30ee693a0454d5b513e361291034a3 SHA-1: c3ed8fdc6e0f84c885604aec102345ce07d7ba8f SHA-256: ae9f7880d38c2f4d2038bd8c76558666c28cbcfa56eca5d78aaa448f5181c0ca
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 0.9990

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://gimoguvi.ru/123?utm_term=ssms+format+sql+add+in PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403563/normal_60684663ea637.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487197/normal_60115f9a21357.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485296/normal_6031c84f56d43.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387706/normal_5fee9a47bf542.pdfIn PDF document text
    • https://pabibajezejav.weebly.com/uploads/1/3/5/3/135323938/dijebof.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475406/normal_5fe3217897029.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367275/normal_605804a1b469c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405644/normal_5febd23de0ed1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383138/normal_5fc6c7746ff9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491410/normal_6038e0a6c2d82.pdfIn PDF document text
    • https://jetasiduneka.weebly.com/uploads/1/3/4/5/134586997/f83b293fa5d639.pdfIn PDF document text
    • https://dinumaditu.weebly.com/uploads/1/3/4/4/134479473/wopab_dasirad_suzibibojawa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418764/normal_605fe55f8b433.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461525/normal_60082a0805793.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401712/normal_604053876f740.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462726/normal_5fc8e5280f345.pdfIn PDF document text
    • https://rajukoxo.weebly.com/uploads/1/3/4/5/134508115/18e1925f3aed.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/48c444d0-c1cf-472b-8cf1-6f2e829785ba/28381363826.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ff2c1bc-bbc3-4cf3-8201-981e56261e72/what_were_two_factors_that_caused_the_bantu_migrations.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66a1574d-b8e1-42a7-9dfa-7495b6e8a40f/where_can_i_get_free_food_boxes_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8708e70-b854-4636-adcd-d6f31bd89e8a/lamudawesobakebujamaxibu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b78ccc6a-19b4-449e-8c62-245550fc087a/gixoxageloju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de7d853c-83e1-4b13-8c22-e2b10490f01d/46184266302.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000105b1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x105B1 16176 bytes
SHA-256: fb440cf8483334b846e05c8011c3368be1c67f4956b7b4969bfad6a99ca84704
font_00_sfnt_off0000f3e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E3 5284 bytes
SHA-256: 67dd88cd0e8e15bbda9ea1236b210b671406f2d3cda4d222efe844cd177cd1a0
font_02_sfnt_off000132b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132B0 11588 bytes
SHA-256: 1f973e14f9ba2ef37acc8028790ab58ad45247bf51dc70bf2398e4a29c7a532e

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