Malicious PDF — malware analysis report

Static analysis result for SHA-256 909fc145ceff3064…

MALICIOUS

PDF

78.1 KB Created: 2021-06-06 20:58:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0c6b637237497bd9d9bad2fa0c3116d1 SHA-1: 34ef232c5466ebaa7e6be1fa1250fdd0778c227c SHA-256: 909fc145ceff306421fadb4cefeed34d4249a7f3dc9bc79e38da7dce2ec241e2
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 0.9998

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://infrive.ru/pbw?utm_term=is+the+ordinary+toner+good+for+oily+skin PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413016/normal_5fd26055b1510.pdfIn PDF document text
    • https://nezafilajulimef.weebly.com/uploads/1/3/4/4/134481311/18baf1ca2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481411/normal_5fe8fa3b374d4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447084/normal_5fe3d7ae3a8d2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402933/normal_5fe01caed59b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388050/normal_60226a3d27942.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473971/normal_5ff12e7a0f64b.pdfIn PDF document text
    • https://vubenazago.weebly.com/uploads/1/3/4/3/134357699/filal_wapodaxige_kexifu_puwamukovinuka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376375/normal_6037e41ce6a84.pdfIn PDF document text
    • https://pepulerizalumel.weebly.com/uploads/1/3/2/7/132740212/mefeliviladevesema.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390684/normal_5fe9a91e1bc86.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458840/normal_5fe1a69aae897.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/99cc7055-e543-4101-b5dc-5ba5945e31f1/lugutuneredazutikozano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45abdfeb-3fbc-4b99-937d-2f9b88ff6d93/warcraft_3_remastered_cheats.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e61dd7a-89e1-4f71-83b6-113ee57c8f37/83798284603.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/320e11cd-924d-4059-8f5d-ff74aa98bfcd/xaseses.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/824985e1-1d1e-4c38-b4b2-beaa2af83510/price_of_nikon_d5200_in_nigeria.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EA 5272 bytes
SHA-256: 9de9e0483200ec07fb1ce6685514f61be792e1be04bf1336c08b52f15d5f5149
font_01_sfnt_off000106df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DF 10504 bytes
SHA-256: 9f7b53ce3d5562824be7d0c461f770f3935e7b959575502074c3d3cc3b0ed227

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