PDF malware analysis — malicious · c4f7b48bca60048f

MALICIOUS

PDF

79.7 KB Created: 2021-03-14 01:54:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20

MD5: ed9d31eeec1d9f81b20fa6dfd1476e66 SHA-1: 2613dc587735383c2f2e03cb27b525c339443d1f SHA-256: c4f7b48bca60048fd317a886dbe1c09daed1800a1626b16855b4a806136e455d

214 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one critical heuristic identifying a link to known malicious redirector infrastructure at `https://crophysi.ru/award?keyword=zestawienie+czas%25C3%25B3w+angielskich+%25C4%2587wiczenia+pdf`. Another heuristic indicates a large link farm within the PDF, suggesting a SEO poisoning or spamming campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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
PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK

PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
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.
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://crophysi.ru/award?keyword=zestawienie+czas%25C3%25B3w+angielskich+%25C4%2587wiczenia+pdf In PDF document text
- https://cdn-cms.f-static.net/uploads/4475727/normal_602ef67f6a648.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4382773/normal_60073e49ef82a.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4417030/normal_5fc85a3eda2fa.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4491436/normal_5fe1c1200cb1d.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4382186/normal_5fc86199ef317.pdfIn PDF document text
- http://potenciy.xyz/bosch_super_silence_plus_42_dba_troubleshootingc3xqa.pdfIn PDF document text
- http://shtampshop.ru/jutetadu0bcbm.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4461791/normal_5fc7b43a3d9d3.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://s3.amazonaws.com/lolijexejomak/30030335578.pdfIn PDF document text
- https://4bd9ed84-c80b-4837-bb2f-b1353ebfd8aa.filesusr.com/ugd/5a1791_dacd738dd1ab460e8a61d3b71f090940.pdf?index=trueIn PDF document text
- https://04a9e765-cf69-4035-9b9a-998d8fb4e692.filesusr.com/ugd/8c5016_84bb3a88d2234ae9bc6a803bd1ae7b8e.pdf?index=trueIn PDF document text
- https://9b704b87-3668-414c-a24e-b30400fe0e33.filesusr.com/ugd/51c472_83812bfce589486db61607b8e86b575b.pdf?index=trueIn PDF document text
- https://43081b45-6e48-4b43-b724-9328fda377ae.filesusr.com/ugd/26481d_c5cfcd4e023a4820bb360b92c7c90cef.pdf?index=trueIn PDF document text
- https://1b6fe947-be7e-4494-9a94-f566f178d3d1.filesusr.com/ugd/89064d_87d43896bef343e6b59897f0259a9b7a.pdf?index=trueIn PDF document text
- https://ec8c99fd-5413-4e38-b6a0-2ccbba71fc6f.filesusr.com/ugd/de02f3_eaec29c579a74273b95024c5f11ea1ad.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/woxojuxafopuv/ratewumav.pdfIn PDF document text
- https://b89c0965-50b5-483f-b67e-52f573158f4f.filesusr.com/ugd/1e222e_e92530ec0075434ab40aebd388f61bce.pdf?index=trueIn PDF document text
- https://510b81f6-be4e-4e40-9acf-3f60af495837.filesusr.com/ugd/5f226b_9f1d5e894b1348ceac0f886759313c77.pdf?index=trueIn PDF document text
- https://28546a20-d0cc-4b82-bb4f-6711990cd5a3.filesusr.com/ugd/0bcf16_b741695d4810482492252836d4663e4a.pdf?index=trueIn PDF document text
- https://4454cc88-256b-48ad-9013-c0414c72072d.filesusr.com/ugd/67e251_dd8a3a14ef2e40ce97bacecde46653c2.pdf?index=trueIn 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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f6e1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF6E1	5760 bytes
SHA-256: `85b9cf7a1997c9c6b0277941769da8792d58157f799ee34e7607d7fba90d377a`
`font_01_sfnt_off00010a0a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10A0A	10976 bytes
SHA-256: `43c6a83f5b7c0f89a7bc8974bc3c37d5e907f8f103f8ce672643739e61f25c4c`

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