PDF malware analysis — malicious · 8cd28b2cb0e2dd6f

MALICIOUS

PDF

96.5 KB Created: 2021-05-14 13:11:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20

MD5: da6b6d85bf9475dbdf3b31668ae25b3c SHA-1: 780bb366267a73dd6c935b0b81310483fa1358ab SHA-256: 8cd28b2cb0e2dd6fee875cc3d9c551b4db3f5b51e61c44b285a43c3fe56b1568

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many hosted on disposable domains, which is characteristic of SEO poisoning or phishing campaigns. The primary URL, https://xajibur.ru/strik?utm_term=berkeley+math+courses+spring+2020, suggests a lure related to academic courses. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to a compromised site or download further malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9990

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://xajibur.ru/strik?utm_term=berkeley+math+courses+spring+2020 PDF link annotation
- https://cdn-cms.f-static.net/uploads/4446272/normal_6017b50c1ff25.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4470985/normal_6035b269b739e.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4497359/normal_605391d3be7ac.pdfIn PDF document text
- https://sokirokesavosa.weebly.com/uploads/1/3/4/9/134901907/1275526.pdfIn PDF document text
- http://papawugamajube.mygamesonline.org/sirugebulosegebupu.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4481841/normal_60394b1335b64.pdfIn PDF document text
- http://gabofovopajojo.iblogger.org/36513015430.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4371809/normal_60417e27006e9.pdfIn PDF document text
- http://tuzojexis.mypressonline.com/absa_home_loan_application.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4413361/normal_601e20ec146e8.pdfIn PDF document text
- https://wopadutizibum.weebly.com/uploads/1/3/4/3/134306931/2d7d384433a.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4456705/normal_6034ecefdac6f.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/mubefula/84641467414.pdfIn PDF document text
- https://s3.amazonaws.com/batoragubukepo/20966591327.pdfIn PDF document text
- http://voxarenilime.epizy.com/vodara.pdfIn PDF document text
- https://s3.amazonaws.com/woxotopapozokev/67925899171.pdfIn PDF document text
- https://s3.amazonaws.com/sezebepit/airplane_flight_sim_2019.pdfIn PDF document text
- http://nejesezape.myartsonline.com/71776044739.pdfIn PDF document text
- http://temusifima.rf.gd/dell_venue_8_pro_5830_case.pdfIn PDF document text
- https://s3.amazonaws.com/punagilelabon/99625257038.pdfIn PDF document text
- http://lumaradidufil.epizy.com/vebutelimibajosukazolo.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
- https://savannah.gnu.org/projects/freefont/In PDF document text
- http://www.gnu.org/licenses/In PDF document text
- http://www.gnu.org/copyleft/gpl.htmlIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f991.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF991	5692 bytes
SHA-256: `be8a0c5d61fa71e6fded1a719f3ef5a9d749ee08613d0024887eade60976fb23`
`font_01_sfnt_off00010d4b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10D4B	5836 bytes
SHA-256: `c27d3ebf8d7aa37cef1f32c99b25767472233bbef2c57ad2d6a86ec0418c593a`
`font_02_sfnt_off00012110.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12110	13072 bytes
SHA-256: `aa7e3eaab6eace15c07fdaedaa6b579de4c7038319191970af94e85f5e8262ed`
`font_03_sfnt_off00014d36.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14D36	16764 bytes
SHA-256: `743776d959c9d7363cf8ffa4553423898ad48cf064a36da86a6f6aa81083754f`
`font_04_sfnt_off0001649b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1649B	6072 bytes
SHA-256: `cd9b408af88c58dc2cc86fa406674a85e46daef3e211b2a626f2bf86516f27ee`

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