PDF malware analysis — malicious · 837c21147c9ab0c7

MALICIOUS

PDF

75.7 KB Created: 2021-04-04 22:46:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21

MD5: 21b3fffa970e89d1e2ccb160a176f992 SHA-1: 77bb9ce167bf319d9e2fb6de026fee50c4f61bee SHA-256: 837c21147c9ab0c7821bc9ef09c8fa1c0a94485d2b3d1dffa7fc72b5d40695a8

244 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The document contains a large number of embedded URLs, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. While no scripts were extracted, the sheer volume of suspicious links and the ClamAV detection indicate a high likelihood of malicious intent, possibly to lead users to phishing sites or malware downloads.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

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
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.
Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM

Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
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=behavioral+questions+answers+pdf In PDF document text
- https://tarivoda.weebly.com/uploads/1/3/4/6/134693378/wefigedubojomej_webofitosalabe_woketinoluvagof.pdfIn PDF document text
- https://lutenidu.weebly.com/uploads/1/3/4/3/134398581/fabifo.pdfIn PDF document text
- https://majotowuwirup.weebly.com/uploads/1/3/5/3/135346036/61905be16c3.pdfIn PDF document text
- https://jajibesuwazigix.weebly.com/uploads/1/3/1/3/131383486/4142363.pdfIn PDF document text
- https://pavenepono.weebly.com/uploads/1/3/1/3/131383439/ramabasaloxesu.pdfIn PDF document text
- http://wugafis.66ghz.com/baofeng_uv-5ra_scanning.pdfIn PDF document text
- https://lulakoxefinadi.weebly.com/uploads/1/3/4/3/134332070/448897cb.pdfIn PDF document text
- https://boguvetasitob.weebly.com/uploads/1/3/1/3/131380850/9c2a347c4a.pdfIn PDF document text
- https://ruwizugaxuluba.weebly.com/uploads/1/3/4/7/134759804/gafivunage.pdfIn PDF document text
- https://gilojezola.weebly.com/uploads/1/3/4/4/134471922/dewojezekuvoxe-koxadupadunaso.pdfIn PDF document text
- https://wixokaregojes.weebly.com/uploads/1/3/2/6/132681478/d4525359b.pdfIn PDF document text
- https://bobiputab.weebly.com/uploads/1/3/2/8/132814039/saloraxugag.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- http://jifazuniduvosi.epizy.com/inverse_trigonometry_formulas_for_class_12.pdfIn PDF document text
- https://6525eaf8-9a42-4119-9fb4-c3d475b3b78e.filesusr.com/ugd/80bfa9_804a80b76004430dbf8110e352f83e73.pdf?index=trueIn PDF document text
- http://jimanujomubil.epizy.com/36701805264.pdfIn PDF document text
- http://dakotibex.epizy.com/piwuletaxipenim.pdfIn PDF document text
- https://22e365c6-0853-42e1-82f8-83473bf9c0bf.filesusr.com/ugd/217d68_4019c97a7bbb4611a077b2468f431714.pdf?index=trueIn PDF document text
- https://f3dbd103-cf2f-44fc-b0ad-c9004dc38af2.filesusr.com/ugd/1f2646_2eb37d2948be4cd086b381feb18f58b5.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_off0000eaef.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEAEF	5456 bytes
SHA-256: `ef94ba7db2c82a9de43783dc0ac7e8c8f8561385f6c709abf9f42c5c99d04e8c`
`font_01_sfnt_off0000fd8f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFD8F	10504 bytes
SHA-256: `0add3d053ed65e152fb14b765407e28e484d80d477c056e6f69defd1ab8fb57d`

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