Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0dfe89004d4c3e1…

MALICIOUS

PDF

95.9 KB Created: 2021-09-16 12:50:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 71aa5f9a07e8e61ad1c938b0b30af4ad SHA-1: 8debca63f8c8c13e5c8aa9b40ae6b16517d0614d SHA-256: a0dfe89004d4c3e1db25a785ec504b999c01ed5fdb75ef0a7c2317dbfb5bc3b8
134 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The presence of a 'download button' heuristic and numerous embedded URLs, many pointing to suspicious domains, suggests an attempt to trick the user into downloading a secondary payload. The PDF itself appears to be a link farm designed to obscure the ultimate destination of the malicious download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1613452b05ceb9---sosaxuf.pdf In PDF document text
    • http://haiphongcontest.com/images/files/84191522042.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/kixigizujatevim.pdfIn PDF document text
    • http://festacreativita.org/userfiles/file/995645831.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/witewexokirinalonedosow.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/71113771250.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16142b32317d48---65141417753.pdfIn PDF document text
    • http://bftt.marketsearching.com/upload/files/57526116774.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/56856340169.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/wasuzega.pdfIn PDF document text
    • https://inprovitcentroamerica.com/ckfinder/userfiles/files/25436749405.pdfIn PDF document text
    • http://keralatravelpath.com/uploads/file/89618675140.pdfIn PDF document text
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/12199141919.pdfIn PDF document text
    • https://h16hr15k-h19hr37urn.com/contents/files/sojisamujapesiraruwosi.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/vovozinafi.pdfIn PDF document text
    • http://megamento.com/_UploadFile/Images/file/5993011027.pdfIn PDF document text
    • https://rwd1.thadv.com/upload/files/76191115699.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/jovabopexewokaximukitix.pdfIn PDF document text
    • http://bjsddesign.com/filespath/files/20210911032215.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/19824687689.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/22380149025.pdfIn PDF document text
    • https://dichvuketoansg.com/luutru/files/dagagem.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/vagawoz.pdfIn PDF document text
    • https://terracell.pt/images/file/pufosugalibunovefokolud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=samacheer+kalvi+9th+books+sciencePDF 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_off00010a5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12276 11036 bytes
SHA-256: 7b919f7011c5e88273f93888feb80a8de91495c9fc550e3ef60262608e9fe886
font_02_sfnt_off00013bf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BF5 21288 bytes
SHA-256: cf20bef238bd073a0f0f97fd41fa2d652689404e11f59f3fbf39ee4d6b0a732c