Malicious PDF — malware analysis report

Static analysis result for SHA-256 f26805c957fea362…

MALICIOUS

PDF

96.8 KB Created: 2021-03-10 13:13:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c78d638858d8dfa3fdd6d419018ce55d SHA-1: d7d0d40b55f924c5bf64c0446b0dfb5977dcc094 SHA-256: f26805c957fea362db3dabee3d9db6cb51803db957322d57f8bba7cf25c263b7
164 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many of which point to other PDFs, suggesting a link farm or SEO abuse tactic. One embedded URL, 'https://pelibifir.ru/wix?keyword=el+eclipse+augusto+monterroso+analisis', is particularly suspicious and likely part of the lure mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/wix?keyword=el+eclipse+augusto+monterroso+analisis
    • https://static.s123-cdn-static.com/uploads/4382952/normal_5fec624591fa1.pdf
    • https://bemetezebore.weebly.com/uploads/1/3/4/8/134882820/66f3fdece8f.pdf
    • https://merebidoso.weebly.com/uploads/1/3/4/3/134344951/96e8fdfa9.pdf
    • https://cdn-cms.f-static.net/uploads/4446921/normal_601174f423502.pdf
    • http://ca-management.website/95486380263bt30h.pdf
    • https://rogifegupoxixo.weebly.com/uploads/1/3/4/0/134040774/xesiluvur.pdf
    • https://cdn-cms.f-static.net/uploads/4409425/normal_6032af8d2be9b.pdf
    • https://fajimidisuwa.weebly.com/uploads/1/3/1/6/131606183/xojoleliwabi.pdf
    • https://static.s123-cdn-static.com/uploads/4490547/normal_5fce7b8f172b1.pdf
    • http://avto-document.site/62326766916tfq3j.pdf
    • https://static.s123-cdn-static.com/uploads/4473947/normal_60073bb38c3ca.pdf
    • http://alphabitx.com/digonitepemevigilazuhbljq.pdf
    • https://static.s123-cdn-static.com/uploads/4417814/normal_60086f575b0f1.pdf
    • https://static.s123-cdn-static.com/uploads/4479710/normal_6008986292a37.pdf
    • https://cdn-cms.f-static.net/uploads/4411220/normal_6027fe0b4751e.pdf
    • https://static.s123-cdn-static.com/uploads/4481420/normal_5fdec6d08553b.pdf
    • http://fsbsiod.com/91269592358u2b5e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7430b7ed-e852-4817-841f-088c3380b429/what_do_scarlet_tiger_moth_caterpillars_eat.pdf
    • https://4abf464d-34d5-4c80-8de5-e64f30e04530.filesusr.com/ugd/8b3eb5_639ba7f1d28b494ebc21bc0b3e35130c.pdf?index=true
    • https://a98f38e8-5810-4fc9-be6a-c3d78c7c4f9f.filesusr.com/ugd/921909_0c01ea2c7f314c36a1e8f75e845c65cf.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c18b5af4-da6e-4f35-93e7-c50dcc0b75d8/99026540608.pdf
    • https://6754c94d-8795-460a-880d-d127bb37d4d4.filesusr.com/ugd/2383dc_e6b2879dbbef46d7b91c241b26e4a683.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f6c0eb11-7c5d-4e7e-afe8-55353cc73660/lomizodo.pdf
    • https://684917c6-b594-4497-9ea4-141105166a5b.filesusr.com/ugd/0dc9f5_30974055f49340d1bcf893cd19509bb6.pdf?index=true
    • https://9387bd13-3746-4408-b474-2867f26e464d.filesusr.com/ugd/ace02d_c8756d29d484498d943f7bfc44d11e78.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012b21.bin
f3fc74d04db77e86f6481198a3d1affbe5c9889ab5826aa749ee7f6ab1473a8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B21 5212 bytes
font_01_sfnt_off00013cc7.bin
63290a4c687a0a61527d08b5f44decbc4425aa70c06eee71bb4c4cb2d635b56c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13CC7 10276 bytes
font_02_sfnt_off00015fff.bin
cb07af63cc967bc725defeb60e0f94def8eca5b79d09fb04145a87b09fb96d38		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15FFF 16076 bytes

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