Malicious PDF — malware analysis report

Static analysis result for SHA-256 41900a426b1e6d09…

MALICIOUS

PDF

82.5 KB Created: 2021-03-08 16:47:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c405fd71e284eb82660726f67c2d3aaf SHA-1: e2815a54f1240e4b5e82bbd71bbe7defac0ffb23 SHA-256: 41900a426b1e6d09c4de529ff7b24437d3b38f08e7b852614e48f0db6f996dd0
164 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ClamAV and a machine learning classifier. It contains a large number of external links, many pointing to other PDFs, suggesting a link farm or distribution mechanism. The document body, though heavily obfuscated, contains text related to 'free download' and the authoring application 'wkhtmltopdf', indicating a potential lure for users to click on malicious links and download further payloads. No scripts were extracted, but the PDF structure and numerous external links are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://druttle.ru/award?keyword=tactics+for+listening+pdf+free+download PDF link annotation
    • https://cdn.sqhk.co/fegibidizog/gcifghi/33120762652.pdfIn PDF document text
    • https://cdn.sqhk.co/govazofaj/U2YR3hi/33998090843.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379038/normal_5ff23e9062c08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371005/normal_601837e3a3b08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450160/normal_600c9d5aa306d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463005/normal_602741029a118.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366304/normal_5ff661d01c3d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500186/normal_60356868cda59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4506200/normal_60324f7a75753.pdfIn PDF document text
    • https://cdn.sqhk.co/resozasevej/eigOtje/60078847490.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467576/normal_601834716a4fd.pdfIn PDF document text
    • https://wuxinaruniluxod.weebly.com/uploads/1/3/4/8/134882591/1665755.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483856/normal_60147da2d2505.pdfIn PDF document text
    • https://zaxixeresez.weebly.com/uploads/1/3/1/8/131871416/devexer-mosixodawana-nopimu.pdfIn PDF document text
    • https://cdn.sqhk.co/tajiwikiter/Bjinhac/incremental_meaning_in_business.pdfIn PDF document text
    • https://cdn.sqhk.co/bojowagawire/j4WAOha/vuporunijeb.pdfIn 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/0bc1b032-abf3-435f-85ff-49444c00a3de/a_feast_for_crows_chapter_22.pdfIn PDF document text
    • https://s3.amazonaws.com/dogazisuze/fishing_report_bandon_oregon.pdfIn PDF document text
    • https://s3.amazonaws.com/wamatasamegu/unstable_angina_guidelines_2016.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b057034-77fa-4aef-a9cc-d1a8a0abd737/zamidazuwo.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_off0000ec3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3B 5364 bytes
SHA-256: 0bcc394dd6c83be7bae5e974e30371f332cd16c68c0ed2f6a42715314869b97d
font_01_sfnt_off0000fe97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE97 14804 bytes
SHA-256: 5226a342fa4e35ec324e0a2583eaf1373d593b4fe972d51cefc12649f6e557c1
font_02_sfnt_off000127a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A5 16080 bytes
SHA-256: 0f592f62031d55fa1d0fb4718f5d067d1987426a283bb2ebc7a28ae7d8d4812e

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