Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8b6c0125c089fef…

MALICIOUS

PDF

88.6 KB Created: 2021-03-20 17:48:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ac0a904df25dca058635597a243269f7 SHA-1: cecd6d36f0311d252bd3acf2d686cb20e9590cce SHA-256: b8b6c0125c089fef256e2d3da407c616b819ef93ab0ec8ea75ea742c4ed09244
196 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO link farms and phishing lures. The primary URL, 'https://druttle.ru/strik?utm_term=how+to+make+a+brine+solution+for+feta+cheese', is identified as a redirector, suggesting a phishing or malicious content delivery attempt. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, further supporting the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/strik?utm_term=how+to+make+a+brine+solution+for+feta+cheese PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4416802/normal_5ff9267fe72fa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464297/normal_5ff4bedad0c68.pdfIn PDF document text
    • https://fokomawirofuteb.weebly.com/uploads/1/3/0/9/130969657/c8dd63d9f.pdfIn PDF document text
    • https://vaxatimiroxak.weebly.com/uploads/1/3/4/6/134617636/3d2c3689.pdfIn PDF document text
    • https://tirilume.weebly.com/uploads/1/3/4/8/134886795/didivusewukevugipesu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480891/normal_6052274df1fa2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476142/normal_602b24c2075fd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://s3.amazonaws.com/wefemabeni/61745350218.pdfIn PDF document text
    • https://s3.amazonaws.com/mekonulegipero/world_human_development_report_2017.pdfIn PDF document text
    • https://36ba0bd5-485c-4bd5-924f-6a5e18dcb854.filesusr.com/ugd/96419b_4125d9e82f1e42718140d9499fc5e95f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zumomasugipeno/g_shock_rangeman_carbon_fiber_strap.pdfIn PDF document text
    • https://s3.amazonaws.com/tufujifinobiro/vorab.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatofubote/41004371271.pdfIn PDF document text
    • https://a5a7f18c-b887-48a0-80cc-3627c14345d5.filesusr.com/ugd/609f59_c0d14d0d26984881b3b0fdb8ba29224a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mipizaju/reckless_love_viola_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/zifilobesumafi/verurilopexevod.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE892 3056 bytes
SHA-256: 383de28b9aa3baae7e761585a69e6fa3fa7bb7dcabd0abc505436b5e94e2cca3
font_01_sfnt_off0000f38a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38A 5376 bytes
SHA-256: 29ab3afb4178a6ac548880b858af0ee51fcca112365b527f19c86e872320001d
font_02_sfnt_off000105ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AC 6148 bytes
SHA-256: 149738eb3e1d0bfb4a5732e89a115965e6f0cf3fc4971c694d3ce3619176544d
font_03_sfnt_off0001158b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1158B 11744 bytes
SHA-256: 940c43ad917dcb8d51d446338cf76abcb5bee46c9415307f4d9f56301918d376
font_04_sfnt_off00013d0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D0D 16684 bytes
SHA-256: cc86994599ca2b6bade3ef2a24080e5ca7d0105f80c2e61a4a6d43fb5994c661