PDF malware analysis — malicious · 9d8f4b822549a2f7

MALICIOUS

PDF

67.9 KB Created: 2021-09-27 22:27:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25

MD5: 10bb1748e9d74402a3c82920e47132c5 SHA-1: 048eb7af7ab0a2d857605f7ef8d8ddb58f40f24e SHA-256: 9d8f4b822549a2f72693062da25cedb1060d2ca0112738acfb942e4e9b91b64d

94 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to various domains, many of which are structured as link farms. The ClamAV heuristic identifies it as a phishing trojan, and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of hosting links on disposable domains. While no scripts were explicitly extracted, the presence of external URIs and the link farm structure strongly suggest a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

Nyx PDF Classifier suspicious score 0.4056

Heuristics 4

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 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
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://queure.ru/uplcv?utm_term=best+free+qr+code+reader+android PDF link annotation
- http://3gr-group.com/ci/userfiles/files/pakemono.pdfIn PDF document text
- http://wonsakai.com/uploads/files/setesidujoxorunivawole.pdfIn PDF document text
- http://rurisnet.org/images/file/kagujisadinejatejagotubet.pdfIn PDF document text
- https://ambient-interier.cz/files/files/mobipepadawivos.pdfIn PDF document text
- https://nevjegyzek.eu/uploads/file/16230090110.pdfIn PDF document text
- https://www.milestonesmn.org/ckfinder/userfiles/files/wodiditisigotegujilulepe.pdfIn PDF document text
- http://nmways.com/uploads/fckupload/file/89387549507.pdfIn PDF document text
- http://reguitti-engineering.it/userfiles/files/mijakuwudavoxebokabujowug.pdfIn PDF document text
- http://businessdevelopmentcenter.pl/uploads/userfiles/files/12185533089.pdfIn PDF document text
- http://radiopoint.cz/userfiles/file/doduvizutotukasateg.pdfIn PDF document text
- http://rsti.biz/files/fck/file/47306728543.pdfIn PDF document text
- http://www.awakohchang.com/image/upload/File/5116548079.pdfIn PDF document text
- http://teamtrinity.net/trinitya/file/83030048646.pdfIn PDF document text
- https://mmtours.si/uploads/jewozutuvani.pdfIn PDF document text
- https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/ed825e33a9e1f09cbe400768f6443bb0/75961854957.pdfIn PDF document text
- https://edu-mate.kr/_UploadFile/Images/file/92267208049.pdfIn PDF document text
- https://aristi-trap.com/upload/users/files/punebugemagu.pdfIn PDF document text
- http://yung-shun.com/userfiles/file/josetegam.pdfIn PDF document text
- https://probidjp.com/ckfinder/userfiles/files/20210903_035827.pdfIn PDF document text
- http://af.ssla.ru/images/fornews/files/vanezemupabuxatoz.pdfIn PDF document text
- https://baigiangtoanhoc.com/upload/files/44023699097.pdfIn PDF document text
- http://krakowska98.com/zdjecia/fck/file/48459271833.pdfIn PDF document text
- http://luxmeterthai.com/ckfinder/userfiles/files/63629174151.pdfIn PDF document text
- http://hutnia.pl/userfiles/file/10789146414.pdfIn PDF document text
- https://nhanloc.net/userfiles/file/15706795824.pdfIn PDF document text
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000b635.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB635	10620 bytes
SHA-256: `cb9a2c30c0a6507352e50b73c53c1ad31f6c898e64fa1ef224043bc49ccd47a3`
`font_01_sfnt_off0000ce75.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCE75	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000e687.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE687	17976 bytes
SHA-256: `8deb31af8a1cf97ce8b4cb76a8b6ffdf5c811bebc9e06e3f07e9fa1cdffac335`

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