PDF malware analysis — malicious · 871bc8a2050fede2

MALICIOUS

PDF

78.4 KB Created: 2021-05-20 08:09:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24

MD5: b54829553339df2c21d25e01845f6ddd SHA-1: 283f04ee4691e2acffd642600f9cea165043cbd6 SHA-256: 871bc8a2050fede2d69177a8b978a81a1348e108f9dc7922f5bbebc06c4bc448

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The embedded URLs are likely used to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9992

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
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.
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://xezojetit.ru/strik?utm_term=cloze+passage+for+grade+4+with+answers PDF link annotation
- https://vumazara.weebly.com/uploads/1/3/0/7/130738753/2218767.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4410217/normal_6042c44b720c8.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4374835/normal_605df2bea633c.pdfIn PDF document text
- https://xomunulozesini.weebly.com/uploads/1/3/4/0/134018183/106599.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4414682/normal_6043785cc26cb.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4408462/normal_60622b74d641e.pdfIn PDF document text
- https://basitonivi.weebly.com/uploads/1/3/4/5/134584834/gopixav_xawifokafaj_muloxaf_bemusipomupite.pdfIn PDF document text
- https://nisozamiroxub.weebly.com/uploads/1/3/0/9/130969329/kuvafevepibom_gufepa_wibijoxizi_gubiderifub.pdfIn PDF document text
- https://sasurejif.weebly.com/uploads/1/3/5/9/135966776/f91ed99.pdfIn PDF document text
- https://ximewenidurap.weebly.com/uploads/1/3/4/6/134651426/40e31276.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4420597/normal_601ec97255e1d.pdfIn PDF document text
- https://nilesezijifata.weebly.com/uploads/1/3/4/8/134885493/jafivifi.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4476453/normal_601629cf41af3.pdfIn PDF document text
- https://javofosuzuvenew.weebly.com/uploads/1/3/4/5/134588543/vukofigewetone.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4423145/normal_6025194228fd7.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4424405/normal_6048a472858a8.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/jivamubug/mepuxegenijemikefijod.pdfIn PDF document text
- https://s3.amazonaws.com/wewiro/english_words_with_meaning_and_sentences.pdfIn PDF document text
- https://s3.amazonaws.com/divexikav/alcides_costa_vaz.pdfIn PDF document text
- https://s3.amazonaws.com/kovilowab/tcp_ip_illustrated_3_volume_set.pdfIn PDF document text
- https://s3.amazonaws.com/xokebore/51363816832.pdfIn PDF document text
- https://s3.amazonaws.com/gomaxod/what_is_the_2nd_harry_potter_movie_called.pdfIn PDF document text
- https://s3.amazonaws.com/ganubatebedoxez/tudanisofoduxoxivetupem.pdfIn PDF document text
- https://s3.amazonaws.com/zaxawetawupo/timami.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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f3a7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF3A7	5436 bytes
SHA-256: `b028d9e373bf422df77cd8b53d1c1b0bbd738511515a37d95bea5de5758bb479`
`font_01_sfnt_off00010638.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10638	11216 bytes
SHA-256: `b8f894babfce101ecf961c462095488cb5761aa1d811c545bfca1540024169b7`

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