PDF malware analysis — malicious · 8f3ce694a33110c2

MALICIOUS

PDF

80.9 KB Created: 2021-09-16 20:57:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: f33e298766992f44587c30f4e3c26127 SHA-1: daef4769e888278c61e004edc0c0c5891c710365 SHA-256: 8f3ce694a33110c2463e247bbb0cb17896aadb153d035df6399e3c0a7617fcae

146 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Numerous embedded URLs and a heuristic indicating a link farm on disposable hosting suggest a phishing or malware distribution attempt. The document body is heavily obfuscated and appears to be metadata from the wkhtmltopdf tool, rather than user-readable content.

Machine Learning

Nyx PDF Classifier malicious score 0.9949

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 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.
QR-code redirect lure medium SE_QR_LURE

Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
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://irlanc.ru/uplcv?utm_term=all+movie+apps+free+download PDF link annotation
- http://rimini-portal.de/bilderarchiv/file/bizofilolefogo.pdfIn PDF document text
- https://jvlegacyhomerepairsmd.com/nbloom/fckuploads/file/jajofazakojusanadivo.pdfIn PDF document text
- http://celyroknaterase.sk/editor_uploads/system/files/90162475992.pdfIn PDF document text
- http://trongtinpc.com/luutru/files/sipidokusarofiw.pdfIn PDF document text
- https://atputasbaze.lv/images/userfiles/files/75891461343.pdfIn PDF document text
- https://loonbedrijfschimmel.nl/userfiles/files/sokaxonobob.pdfIn PDF document text
- http://bluebossa.pl/files/file/marapirajaxivoxefare.pdfIn PDF document text
- http://mediedil.eu/userfiles/files/58867028040.pdfIn PDF document text
- http://leeandrewdavison.com/download/tunakomirosabapavi.pdfIn PDF document text
- https://carrieres-pierre.com/userfiles/file/53909639164.pdfIn PDF document text
- http://wwstationery.com/files/file/fosoxebewabapekox.pdfIn PDF document text
- https://thibiditrading.com/public/userupload/files/nujuniroriv.pdfIn PDF document text
- https://braveathlete.net/geektic/files/lorukevibametarufab.pdfIn PDF document text
- http://forti.in/userfiles/file/gefiwurexel.pdfIn PDF document text
- https://mobspace.xyz/web/img/podborky/files/39617314414.pdfIn PDF document text
- https://badrivishal.com/media/lexumewigaf.pdfIn PDF document text
- http://daegyung.kr/userfiles/file/20210910110047.pdfIn PDF document text
- http://xinshifm.com/userfiles/file/jikelepajafaw.pdfIn PDF document text
- https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e699d6b5e---gunorabadilodalosevupedap.pdfIn PDF document text
- https://chandrakantmusicacademy.org/ckfinder/userfiles/files/nujolataviluwu.pdfIn PDF document text
- https://www.comperat-89.fr/ckfinder/userfiles/files/86740985475.pdfIn PDF document text
- http://diennuocdanang.com/uploads/image/files/85450182658.pdfIn PDF document text
- http://izhar-energy.com/userfiles/file/9715117407.pdfIn PDF document text
- http://queenart.kr/userData/board/file/zidilivujebedajuwo.pdfIn PDF document text
- http://baoveantam.info/upload/files/6604563275.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://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_off0000d56c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD56C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000ed83.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xED83	10692 bytes
SHA-256: `4131974a593bf05c0869c7b31c2fa58452ae68191815a4994f117074f7136024`
`font_02_sfnt_off0001060b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1060B	17884 bytes
SHA-256: `f2542d05ccca13efde7555cad8e4abb5dd58a6edbae6352de46c29cdf7af3e58`

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