Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fdf8a16bff3fc18…

MALICIOUS

PDF

99.5 KB Created: 2021-03-28 09:09:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 04d1f0e2e713736a07d1d86ce359e39b SHA-1: 2d121d1159dd17d9b25e40c3f6c886de9c3d52cd SHA-256: 7fdf8a16bff3fc18c3a80aba9c2da4d3a54f55187ef27684609385316233efed
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, indicating a phishing or malicious redirection attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://crophysi.ru/strik?utm_term=what+are+the+consonants+and+vowels+in+korean
    • https://tenasubilojeviw.weebly.com/uploads/1/3/5/9/135993528/furigaseromurerigud.pdf
    • http://sirofopunisatus.iblogger.org/anaerobio_facultativo.pdf
    • http://gukivuzijisuva.getenjoyment.net/cisco_wrt160n_default_password.pdf
    • https://tumafivefaj.weebly.com/uploads/1/3/3/9/133999435/dosazoze-botab.pdf
    • http://muwiduvepobuz.mygamesonline.org/ledopifavuxovedivazumades.pdf
    • http://mopexaxurip.getenjoyment.net/calgula_de_albert_camus.pdf
    • https://static.s123-cdn-static.com/uploads/4426942/normal_5fcca45a19d9e.pdf
    • https://cdn-cms.f-static.net/uploads/4393363/normal_603fa61a10e4d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jagivaxo.rf.gd/gokuxajumivekajowisidol.pdf
    • http://livofos.epizy.com/6302234001.pdf
    • https://4e4301d6-cc9a-4939-960a-6b497c1efea6.filesusr.com/ugd/d78803_45af5fcf02b04126af7e265b8a3455e8.pdf?index=true
    • http://sawurawefivovo.myartsonline.com/mapa_rodoviario_alemanha.pdf
    • http://jekojefakowosep.rf.gd/kenai_river_fishing_guides.pdf
    • http://mixonanax.epizy.com/81822567211.pdf
    • http://joriboka.epizy.com/dengue_hemorrhagic_fever_guideline_2017.pdf
    • http://mepudizik.rf.gd/sikixez.pdf
    • https://4407eba0-147d-4e9d-98ff-19010b67f466.filesusr.com/ugd/c1f2fd_620261e1413d4fd9b008b1ac6f0ed364.pdf?index=true
    • http://korudowewufo.epizy.com/how_to_connect_to_furby_bluetooth.pdf
    • http://fonedasin.epizy.com/69462587319.pdf
    • 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://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011391.bin
322e97c002f7730f7f2b5b51cb37cd0f0a67b52b2cc8525c6451b6ec82b85182		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11391 9556 bytes
font_01_sfnt_off000132c9.bin
4c63f61cae724860713103cdeb087cc8a61102ba05232883d3663ab913284b5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x132C9 5256 bytes
font_02_sfnt_off000144bd.bin
82e8083d7da73a7a823de743306a124c6a48dec0a87eea05e379bd5d6ea6d6d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x144BD 10432 bytes
font_03_sfnt_off00016895.bin
b2cbfceaf44fc4a56d1321c5677f125dfbde6a5f8c873b6a17361dd7c2aa5302		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16895 16232 bytes

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