Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf0979e6b4150b42…

MALICIOUS

PDF

92.5 KB Created: 2021-05-28 15:57:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6f18887c9a8c48619dc00c815bd34b59 SHA-1: 96192056e55f8a27cdfbedf2dd81dfc6af6e1696 SHA-256: cf0979e6b4150b420ce1295dd0b6d0105ab556d8adb0d5974848859d67fe6373
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://gimoguvi.ru/strik?utm_term=7.2+complex+patterns+of+inheritance+section+quiz+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4489844/normal_60124fee53729.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374698/normal_6060aea326456.pdfIn PDF document text
    • https://xogexemufak.weebly.com/uploads/1/3/1/4/131437987/2943392.pdfIn PDF document text
    • https://borojiwanap.weebly.com/uploads/1/3/4/2/134235821/wurosadidu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389820/normal_600003d703dc0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383131/normal_5fd93c5f7c8b0.pdfIn PDF document text
    • https://waluxine.weebly.com/uploads/1/3/4/7/134759732/diduwebiwizuwulame.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377400/normal_5fd8a61850d7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366969/normal_6043debfc0956.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497131/normal_5ffc9e2329031.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413468/normal_604e36babcb6a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427783/normal_6005829bebcfa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459324/normal_606dd9cdc1f5b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470205/normal_5fc6217667a20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378404/normal_6048578de9bde.pdfIn PDF document text
    • https://zawiwiguxasawum.weebly.com/uploads/1/3/0/7/130739629/7064654.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483842/normal_5fe03febc94d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391331/normal_605552924c825.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://uploads.strikinglycdn.com/files/fb0764e1-9b34-4bde-950e-5622a323e98b/55654160416.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d12f3bd-d63a-4980-8170-d7cbac0dc924/netflix_culture_deck_patty_mccord.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_off00011f96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F96 5624 bytes
SHA-256: 53bf1a0cdcb5f59a3d26cd01f5c093ab2a09b17ed6c142fde8b235c79eed17d9
font_01_sfnt_off000132a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132A5 10412 bytes
SHA-256: 2c42fe4a89838b6afee09516b71625eb127de2869abdd1a33de352983c9552e6
font_02_sfnt_off00015646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15646 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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