PDF malware analysis — malicious · fb27c7e641140493

MALICIOUS

PDF

79.3 KB Created: 2021-04-15 11:40:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20

MD5: 42de834eaf97eca3fc4245900c143373 SHA-1: 6ec08e1cde62c782b4e4e2110277697a58863bfe SHA-256: fb27c7e641140493b1e3e8e6fb6567e21d5bc329d0e94d0bf37e47eb2e78049d

184 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure related to 'Fluval 206 canister filter parts'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9996

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 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://yafferge.ru/strik?utm_term=fluval+206+canister+filter+parts In PDF document text
- https://static.s123-cdn-static.com/uploads/4462345/normal_5ffe84410f049.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4456134/normal_601a61783d0bb.pdfIn PDF document text
- http://good-production17.site/time_jumpers_movie_wikipediant13n.pdfIn PDF document text
- http://allieshouseofhope.com/33780251678pe71y.pdfIn PDF document text
- https://bugotenopiziwa.weebly.com/uploads/1/3/0/9/130969298/mewademo.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4473056/normal_604ac8168299b.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4374374/normal_604ce98660d70.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4388065/normal_5ff7d5fb1144f.pdfIn PDF document text
- https://gimepokik.weebly.com/uploads/1/3/1/6/131636980/319604ba.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://s3.amazonaws.com/lupebesu/setagijonojiligasonox.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/15f34f16-ddf2-4e84-ac0a-ca6a6e634769/how_to_get_my_ham_radio_license.pdfIn PDF document text
- https://s3.amazonaws.com/lupuvogotog/hp_envy_4500_printer_offline.pdfIn PDF document text
- https://6afed14e-2b01-442b-8c2e-11a8a6f39965.filesusr.com/ugd/46a5ae_4779f4bf371e4edea58b6323b84efee7.pdf?index=trueIn PDF document text
- https://8aefc570-8454-48c3-bb63-d4d1067b7ce0.filesusr.com/ugd/5c9621_49cd4bf2fb1a4c359257cad45328c2ee.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/vuzotisenixava/befijofubosupofuwanurelos.pdfIn PDF document text
- https://8d6920c1-aef5-45ed-b1a0-e693d63948fb.filesusr.com/ugd/0a593f_d74e504d027c493eb3ac347d62cc6c6e.pdf?index=trueIn PDF document text
- https://uploads.strikinglycdn.com/files/706ca38f-2664-4f98-8284-fee81e0e5bc2/larexirefovekebanono.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
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000d578.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD578	5224 bytes
SHA-256: `f52a642d4f76225dd471124171140f0ad2d626109e1895172de04a15f25ee4d4`
`font_01_sfnt_off0000e73f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE73F	10420 bytes
SHA-256: `98cc93056959bf1e2e5383e410cfe76074a4d06e3d409245bf3f51b551843ca7`
`font_02_sfnt_off00010ae4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10AE4	16204 bytes
SHA-256: `e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15`
`font_03_sfnt_off00012012.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12012	4324 bytes
SHA-256: `0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333`

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