Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fe360eece8ccd29…

MALICIOUS

PDF

82.9 KB Created: 2021-09-19 17:38:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 138b6a46282a2d17c12b2770dc3903eb SHA-1: 257672e938b4c5d89c4a34f22d300392584e6575 SHA-256: 4fe360eece8ccd2975c3799a6cf545516fa3a46f116bcafec5f3f47c7b9519d5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, hosting numerous external URIs on disposable domains, with one notable URL being https://allytemp.ru/uplcv. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its malicious intent. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://allytemp.ru/uplcv?utm_term=fire+tv+stick+lite+plex PDF link annotation
    • http://intelekt.biz/uploads/pages/files/runonijosuzijev.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/mefegirutikekesimiripol.pdfIn PDF document text
    • http://vip-cond.ru/userfiles/file/somadu.pdfIn PDF document text
    • https://xedulichhaiphong.vn/images/news/files/4011458018.pdfIn PDF document text
    • http://jiji.pgo.tw/pic/uploads/files/71788554086.pdfIn PDF document text
    • http://spynet.gr/Administrator/uploads/userpics/OutPostImages/files/xanowe.pdfIn PDF document text
    • http://honda-vo.com/upload/file/nezazilelupasiwejato.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/ca9c603a6d2fa70c2801d4651fbec4c3/fekewa.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/ralazijunozoropis.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/zewivikirobos.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/vagufitajaxuxalivenosip.pdfIn PDF document text
    • http://frickcontrols.com/uploads/files/nizaxajabijaraletewak.pdfIn PDF document text
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/37749038022.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/88823172147.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/ruliranavivuxi.pdfIn PDF document text
    • http://bdnchem.com/upload/files/rutejomuvuterogudib.pdfIn PDF document text
    • http://peetersinstallatietechniek.nl/upload/files/30880941965.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/gemudupudupesofemowazemuw.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/devumefuvamovodo.pdfIn PDF document text
    • http://thibidi.vinadesign.info/uploads/images/files/7471688404.pdfIn PDF document text
    • http://systempro.kr/userData/board/file/92726343528.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/1630783394851875074.pdfIn PDF document text
    • https://probidjp.com/ckfinder/userfiles/files/20210917_002334.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4c0f484c4---fumonazagikoxidosisekobuw.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.

FilenameKindSourceSize
font_00_sfnt_off0000e001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE001 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF813 18052 bytes
SHA-256: c6edf5bc5b3471e3bab0133dde5f40d0afc9a85ca3ef624be27cb65490d2c05e
font_02_sfnt_off0001272a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1272A 10220 bytes
SHA-256: af85e61b376347a8cc38af790ab5c9b4a00309aa32d097184ea9a7746f214fc0