Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2b0e83bc8895e32…

MALICIOUS

PDF

70.1 KB Created: 2021-09-09 17:13:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d371dd9422697683bc2205c4e22732e4 SHA-1: 0d729214e7ddfa24db2a5cc708bf124d3719f001 SHA-256: d2b0e83bc8895e328c02227f6245ea06304a63d3b795ad5975436ed99f9c9087
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the presence of numerous external URIs and the overall structure strongly suggest an attempt to lead users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://ptaki.info/imgekoprojekty/files/jimutasadupuvodazex.pdf In PDF document text
    • http://architettoseneca.com/userfiles/files/85529583558.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/kemofurugizejunedesimodor.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/55056535187.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea7a322629---23109054562.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1630838870.pdfIn PDF document text
    • https://aarushimukhwas.idealviews.com/userfiles/files/31597192742.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/52272853609.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b2bf569c7---rugiw.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/79322937152.pdfIn PDF document text
    • https://sukhayurveda.in/userfiles/file/zabikukarivefedudik.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/depojedaxuderejotubog.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/suneg.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/mawawosubaxufofusujame.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/27460361348.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/wopoj.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///7666547537.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/23877985965.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/nisodovetiworodawo.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name/files/5051274675.pdfIn PDF document text
    • http://wych123.com/upload/files/85151170833.pdfIn PDF document text
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/88742553935.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=mini+militia+cheat+gamePDF 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.

FilenameKindSourceSize
font_00_sfnt_off0000b53a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB53A 10280 bytes
SHA-256: 16e09bb729f28fece5d79ef871bf6bcb105a84c5f11e368214afe0fd42086e0b
font_01_sfnt_off0000cc20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE432 15216 bytes
SHA-256: d32a91111cf9507a36a009e3fe31e7b6b4d50338453a788453f80ccedba7a6d1