Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6994f1a9ebc8ec4…

MALICIOUS

PDF

84.9 KB Created: 2021-09-19 18:06:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 561d478b6653f320e2d5957f722dc674 SHA-1: d2b39e407d2987a22c95eec0164cccc221c2e594 SHA-256: d6994f1a9ebc8ec429dfda7fa596df71cc5bbcf961d6cdd313fa8f1bc057d65d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, and a heuristic specifically flagged it as a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://rajaketiga.com/contents/files/2383351609.pdf In PDF document text
    • https://thegmsbihta.in/userfiles/file/39762827626.pdfIn PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wusababizel.pdfIn PDF document text
    • http://186086.com/upload/files/fodugavemirifetim.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210906/0450186884.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/75164139216.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/749906ef649c55d0988e43e5962d0620/92135672354.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/42367819669.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/33106421307.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/rekaxakare.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/mokakorifapa.pdfIn PDF document text
    • https://kultmotor.hu/images/files/44202857877.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/papoforepewuwidizakil.pdfIn PDF document text
    • http://mrs724.ir/basefile/drtiketcom/files/63467473774.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16146210eac77c---neseduvusuvapukaguxev.pdfIn PDF document text
    • https://millvalley.com/wysiwygfiles/file/guvogidawumem.pdfIn PDF document text
    • http://rurisnet.org/images/file/44178363230.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/75014984153.pdfIn PDF document text
    • http://duplisite.com/userfiles/file/63204837508.pdfIn PDF document text
    • http://njxinbell.com/upload/files/38645032494.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/sajifinupizepifo.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/fexegonusurigiso.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/89356691868.pdfIn PDF document text
    • http://newtrichur.com/userfiles/file/rerafema.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/tirot.pdfIn PDF document text
    • http://weingut-suppan.at/files/8384553999.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=phrasal+verbs+pdf+exercises+with+answersPDF 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_off0000e641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE641 17652 bytes
SHA-256: 2f9b9abdc5a6b887c7483bda3f9501897b09ba5326bb1dae3330400bff94aff5
font_01_sfnt_off000113dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113DD 10992 bytes
SHA-256: 4bf35372c9b290ecaad1e10b78f0fe6d4f8f4959b34d526f024d7e958fbc8681
font_02_sfnt_off00012d2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1