Malicious PDF — malware analysis report

Static analysis result for SHA-256 da4b4edc35098032…

MALICIOUS

PDF

77.5 KB Created: 2021-04-03 06:16:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 679ebf1d14bc5c424571413bb4fac3c8 SHA-1: 72508706d40df8ceed7582add90e264c6da035cb SHA-256: da4b4edc3509803267e2d90e66da7b34edd0a7e35419578346876719ecdfd8fd
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 0.9997

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://xajibur.ru/123?utm_term=beamforming+automotive+radar PDF link annotation
    • https://notefusiwedamap.weebly.com/uploads/1/3/4/8/134872173/27e36e746145a.pdfIn PDF document text
    • https://xalifabosivibu.weebly.com/uploads/1/3/0/7/130775217/6084021.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450732/normal_6067be4edcfb0.pdfIn PDF document text
    • https://vegerezunu.weebly.com/uploads/1/3/6/0/136053786/bd499091baf818.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375203/normal_6067a00c570c3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474475/normal_5fc87bd6dfd5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379387/normal_605d932d56b28.pdfIn PDF document text
    • https://gixisinada.weebly.com/uploads/1/3/0/8/130814349/nupigawozax.pdfIn PDF document text
    • https://zoximubovug.weebly.com/uploads/1/3/1/3/131379564/dewake-nevuxibewaz-dowonevu-savawemobanim.pdfIn PDF document text
    • https://wixotavu.weebly.com/uploads/1/3/4/7/134764887/vekewur-pixanujof-nosademekem-kabaneragibi.pdfIn PDF document text
    • https://xiwikufebalub.weebly.com/uploads/1/3/1/4/131438050/bbe2bb5d.pdfIn PDF document text
    • https://nelizozab.weebly.com/uploads/1/3/0/8/130874358/620d1dc2c31.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/buganabowumujef/how_to_modify_submitted_passport_application_form.pdfIn PDF document text
    • https://s3.amazonaws.com/selivuvumepaveb/98892120155.pdfIn PDF document text
    • https://s3.amazonaws.com/wivunonovef/what_is_fb_news_feed.pdfIn PDF document text
    • https://6c9aa500-f8d9-42a6-b8a4-5b3c562bbfc3.filesusr.com/ugd/543886_ee890b554dac4318a7e1ed386790682c.pdf?index=trueIn PDF document text
    • https://ea74ff18-003d-4094-8454-8d7e15e33abb.filesusr.com/ugd/50de67_8f48a91a1c84457ab523198574128b10.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/posaxugidut/who_is_the_strongest_chinese_god.pdfIn PDF document text
    • https://b2f02272-107b-4032-aafc-54cdd6265a16.filesusr.com/ugd/6cf392_af1af4b8e8e74899afd3a47a50832a9c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sumesawoxajew/18550062687.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_off0000e49a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49A 5008 bytes
SHA-256: d100e9bf3e99e610b5718e2e414abcac56993555397b5ef2688791370566aee6
font_01_sfnt_off0000f594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF594 10824 bytes
SHA-256: 3b06743230a46201f36bda76ffedeac3f0e3047736a7bc1479caecd5faec1170
font_02_sfnt_off00011ab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB1 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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