Malicious PDF — malware analysis report

Static analysis result for SHA-256 929840a14f1309e2…

MALICIOUS

PDF

85.1 KB Created: 2021-09-18 08:09:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0543be66d05b40cec185653a4c77d8ff SHA-1: 227d78c55a6efbdb1da7d8517f0d5c3b96903b40 SHA-256: 929840a14f1309e20e07609cf5763a10c9caf8f9e62e358be5c24973e8a51f3e
166 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, with a high heuristic score for social engineering (ClickFix). The document body is heavily obfuscated, but the presence of numerous embedded URLs suggests an attempt to lure the user to external sites. The SE_CLICKFIX heuristic indicates the document likely instructs the user to perform an action that bypasses security controls, such as running a command.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://ilkconstruction.com/Images/Media/files/94270266244.pdf In PDF document text
    • https://inverpalmas.com/aym_image/files/fuvajokafefem.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/povasuzaxig.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/12040838554.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/78018906238.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/fetezedesanuwofegijiveg.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/7097565646.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/9134730752.pdfIn PDF document text
    • http://rigassprotes.lv/uploadz/file/mezurem.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/21041751662.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/15672568665.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/tinobevizojofo.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/80968031220.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f32944cbb---37637381618.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/14655921243.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/47529626022.pdfIn PDF document text
    • https://cristalensi.com/public/File/zivimanulezuribod.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/wajavexonifewi.pdfIn PDF document text
    • http://dichvutot99.com/webroot/img/files/defuxuri.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/nusevalinapetud.pdfIn PDF document text
    • http://polenes.cl/userfiles/file/57047499397.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/83310024748.pdfIn PDF document text
    • https://bak.vn/upload/files/vozinimorosisepafibamifad.pdfIn PDF document text
    • http://motocams.cz/ckfinder/userfiles/files/xemezameretibogizepoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=windows+stuck+on+startup+screenPDF 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_off0000e84c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001005e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005E 17864 bytes
SHA-256: f734efa74663e27ed7bcf16761c6c55f1479b79a93819fc12bbc1978807779e7
font_02_sfnt_off00012dbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DBF 10732 bytes
SHA-256: d5d76b99803f43b9bb990e3260f9b6869b599bda1c46ae460267d68a1aa8d51c