Malicious PDF — malware analysis report

Static analysis result for SHA-256 08f68063fb11f300…

MALICIOUS

PDF

82.6 KB Created: 2021-09-12 09:35:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4b5f367641435a1ec295c11546c2380f SHA-1: 1a0071ee1a700e39360a93b914f9864144432f78 SHA-256: 08f68063fb11f30044dc871c0cdb82c2c20b697f206f24ca1cf5e6fe466b45fc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to potentially malicious or unknown domains, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further indicates a pattern of distributing links across disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 5

  • 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.
  • 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.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6a158035f---2648604714.pdf
    • https://net-mex.hu/ckfinder/userfiles/files/38828638592.pdf
    • http://tobn56.com/UpFiles/file/49880591568.pdf
    • http://whuntex.info/userfiles/file/zatoluzosazu.pdf
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/47992570451.pdf
    • https://bushregenerators.net/userfiles/files/dikaguxi.pdf
    • http://sakem.org/userfiles/files/gadagima.pdf
    • http://liily.jp/upload/file/20210906221452.pdf
    • http://saothienemb.com/uploads/images/files/74780667695.pdf
    • https://bluetact.com/ckfinder/userfiles/files/penuj.pdf
    • https://briljant-maleri.se/UserFiles/files/84005412144.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139cf4c279fb---18648898903.pdf
    • http://perlawarmii.pl/userfiles/file/xaxexidapikakitaw.pdf
    • http://azseal.net/uploads/userfiles/file/79243728208.pdf
    • https://lrdreamteam.com/files/files/file/InfoProduct/file/mudusiterepow.pdf
    • http://zhfangyuan.com/uploadfiles/files/23473321029.pdf
    • https://walkandsmile.com/userfiles/file/45350914176.pdf
    • http://bridgeonlaw.com/filespath/files/20210901145055.pdf
    • http://backkwang.com/userData/board/file/61271314018.pdf
    • http://metzlerranch.com/userimages/temawuwupajejagana.pdf
    • http://jingyitech.com/uploadfile/wudijobagijegoba.pdf
    • http://2990592.ru/ckfinder/userfiles/files/zorurodelexupiwidelawux.pdf
    • http://capableapp.com/uploads/files/xowunes.pdf
    • http://urotunisia.com/uploads/FCK_files/file/75455160178.pdf
    • http://jlm-kg.com/uploads/file/80652640788.pdf
    • http://esistore.lu/userfiles/file/bakoluzamajuzuw.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=apps+for+hiding+apps+on+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e03a.bin
7602f8869b1e1f94cc6a0598de5c95ff6fd10e35b9ffba50eb2ae8ec417c34aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE03A 10484 bytes
font_01_sfnt_off0000f7b9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B9 16792 bytes
font_02_sfnt_off00010fcb.bin
7d16109a6ca5dd24e5247334cf40532796851061a07455b9a2f0f0c6eef87463		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCB 17348 bytes

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