PDF malware analysis — malicious · ff50d8fd07feb3fd

MALICIOUS

PDF

86.4 KB Created: 2021-09-11 02:51:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: cd2f0b8cc7bb942993d124bf4962610a SHA-1: d1f783fd54d7e8b6c66a2b02510b615d30c69ad4 SHA-256: ff50d8fd07feb3fddb910d88b6e4bb8562ff50a6eb73256299f03d01ad8396c4

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains and forming a link farm, suggests a phishing or malware distribution scheme. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a malicious link aggregation.

Machine Learning

Nyx PDF Classifier malicious score 0.9969

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
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 http://tomekorea.com/userData/board/file/67860420257.pdf In PDF document text
- http://haisushitogo.com/uploads/files/kezedixuxowabelanolisizi.pdfIn PDF document text
- http://cukrarska-vyroba.cz/UserFiles/File/57084552469.pdfIn PDF document text
- http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/labijikenes.pdfIn PDF document text
- http://aromaonly1.com/yamituki-n/uploads/files/29000856587.pdfIn PDF document text
- https://kochitaxirental.com/ckfinder/userfiles/files/bamixuzuvuzo.pdfIn PDF document text
- https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139318b81ff6---xijasajezorevovikoj.pdfIn PDF document text
- https://opescom-store.com/uploads/FCK_files/file/97645976614.pdfIn PDF document text
- https://perfumes.dropship-tracking.com/userfiles/files/17880891415.pdfIn PDF document text
- http://baheth24aqari.com/ckfinder/userfiles/files/liniverine.pdfIn PDF document text
- http://asvpp.fr/pdf/24717404432.pdfIn PDF document text
- http://firmen-bekleidung.at/userfiles/file/jaduwolubidov.pdfIn PDF document text
- http://paoladebenedetti.eu/userfiles/files/nafapilupivo.pdfIn PDF document text
- http://studiospazioambiente.it/userfiles/files/gixitim.pdfIn PDF document text
- https://happen.webasl.com/userfiles/file/12901725726.pdfIn PDF document text
- http://stringquartet.biz/web/images/fck/file/42155361207.pdfIn PDF document text
- http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/wamefebivibezodilejenijis.pdfIn PDF document text
- http://hindel-relax.ch/ckfinder/userfiles/files/dinixov.pdfIn PDF document text
- http://www.maderas-navarro.com/ckfinder/userfiles/files/tavafosufedumujopaf.pdfIn PDF document text
- https://www.emcp-pmce.ca/_includes/ckfinder/userfiles/files/87245394869.pdfIn PDF document text
- http://bidwoodmachine.com/d/files/25217070991.pdfIn PDF document text
- http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/1011eeac132bb2cbf0ec13d7e3a121d9/maporowepoputurobeki.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=s20+ultra+live+wallpaperPDF link annotation
- 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_003_off0000d1fd.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0xD1FD	17568 bytes
SHA-256: `890264b0cb7175aace42c17dc22f11fa47d17a247e34b189376232e5150fe6df`
`font_01_sfnt_off0000ec3d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEC3D	10420 bytes
SHA-256: `4b260f640f323d94c4bd91cc782f6ce5b72af414c8845ab5e8a471056311692b`
`font_02_sfnt_off00010427.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10427	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_03_sfnt_off00011c39.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11C39	18216 bytes
SHA-256: `5530eaf6426d348e3aaa23719b525fabc981fce2bdead50a8e665dad5ec7160e`

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