PDF malware analysis — malicious · d6f16c57ae073506

MALICIOUS

PDF

81.9 KB Created: 2021-09-20 13:25:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: e06ecba2cd71a2ca5dfb6b7f9fca2d80 SHA-1: ed4651bb560c2d7abbf3c4e04bd24ec9103f6c9a SHA-256: d6f16c57ae073506f77d2bfcd0fe5dad1889c0871f0f14a1e0c4be9a9c4a4b5f

134 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 returned a high probability of maliciousness. The PDF contains embedded JavaScript, which is often used to download and execute further malicious content. Numerous external URLs were extracted, many of which are likely part of a link farm or hosting the next stage of the attack.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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://www.heksan.com.pl/file/wipukusu.pdf In PDF document text
- http://nuitsdartistes.eu/images/file/zowasuxupeni.pdfIn PDF document text
- https://maritime-models.com/userfiles/file/60375578937.pdfIn PDF document text
- https://thinkglobalcompliance.com/ckfinder/userfiles/files/46951432056.pdfIn PDF document text
- http://dioblina.eu/userfiles/file/junoxeromumasamemubiz.pdfIn PDF document text
- https://cauthinh.com/luutru/files/41248130508.pdfIn PDF document text
- http://avtrak.ru/ckfinder/userfiles/files/30100404915.pdfIn PDF document text
- http://nextgenship.net/upload/file/20210914163161649425.pdfIn PDF document text
- http://weddingdove.tw/uploads/files/202109181527072813.pdfIn PDF document text
- http://kurumakaitori-one.com/js/upload/files/13395596870.pdfIn PDF document text
- https://premium-house.uz/images/file/digapokuxamake.pdfIn PDF document text
- http://uceng.net/_UploadFile/Images/file/gutojudaro.pdfIn PDF document text
- http://cctsw.net/whly/up_files/FCK/file/20210908_005557_141.pdfIn PDF document text
- https://pharma-tools.eu/galeria/file/nomavefolupazozujinitiko.pdfIn PDF document text
- http://www.instalacionescueto.com/nueva/ckfinder/userfiles/files/88669717814.pdfIn PDF document text
- https://asiahealthcaredentalcentre.com/ckfinder/userfiles/files/toxiwerak.pdfIn PDF document text
- http://trieuduong.com/images/Download/40051752382.pdfIn PDF document text
- http://studiocinti.eu/userfiles/files/nitudigejule.pdfIn PDF document text
- https://extremedriveline.com/ckfinder/userfiles/files/75426299111.pdfIn PDF document text
- http://www.neoneofitou.com/ckfinder/userfiles/files/mifasalozokaxupadana.pdfIn PDF document text
- http://doctour.hu/uploads/ckfinder/userfiles/files/gesutoporavajaxo.pdfIn PDF document text
- https://valubil.com/public/uploads/cms_file/cms_files/76086055331.pdfIn PDF document text
- http://geologocarmignani.com/userfiles/files/maxukemebagininulepagas.pdfIn PDF document text
- http://adgroup.co/userfiles/file/3204330143.pdfIn PDF document text
- http://arablift.net/userfiles/file/sabupokejapagogizokozoz.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=super+mario+bros+para+androidPDF 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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000da14.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDA14	18348 bytes
SHA-256: `43b1c5d56a808961699aee6ffcd88c1108b1ae063267c7f25e26ac5b2d246ebb`
`font_01_sfnt_off00010924.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10924	10724 bytes
SHA-256: `0caeae8f90600464f958532eda5d03ee49be55feb717668603000ce621d01823`
`font_02_sfnt_off0001216f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1216F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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